Such a honor listening to you I send your videos to my 23 year old son getting his feet wet in the hvac industry Been doing for 30 years and I have tremendous respect of your skill and knowledge Thankyou so much From bulletville Chicago
I was repairing a Microwave oven and got shocked by the capacitor and it stopped my heart. It had been unplugged for a week. I lost consciousness and woke up on the floor. The sudden stop when my butt hit the floor started my heart again. Discharge your capacitors with gloves on.
Doesn’t matter how you get the point across or what illustrations you used to do that, the point is that people understand what you’re teaching them , don’t ever let anybody tell you anything different you don’t apologize for the way you teach ever. Just keep doing what you’re doing brother.😎🇺🇸🪖👍
This is my favorite subscription by far. Ive relearned things I had forgotten and been set straight on things I thought I already knew for years. It will make you a much better troubleshooter.
Time for me to toss out my grandfathers DIY book on basic electricity and break out a copy of Macbeth. That was a nice mix of information and humor. Great stuff.
I would express the utmost gratitude for sharing this content with the universe of inquiring minds. This is how we expand consciousness by enlightening each other through science informed education with a personal human touch via the internet of things 🙏
I’m a student, these explanations makes really easy to understand electricity, I know it is not exactly like that, but it’s enough to be introduced. Thanks
Thanks very much for the detailed explanations. This feels like a fairly comprehensive introduction to me! I am a homeowner gearing up to DIY some electrical conduit in my new garage workshop, and I wanted to brush up on what I learned in high school physics with a new focus on working with electricity safely. I'm glad I found your channel; I think this video was just the ticket!
1:12:30 - The most fascinating magic in electronics, to me is how you can open and close a switch to a coil really fast and get more voltage out than the applied voltage (e.g., high- and low-side MOSFETs on a laptop motherboard).
You are a great teacher man! I usually have to watch videos about 3 times just to start understanding everything in the video. You teach me something new and then go further with explanations and stories and relating them to things i understand completely and it sticks. Love it man i didnt even start trade school yet but i feel like im ahead with these videos^
44:19 - “As you were, Sir!” OL means Over Limit or Outside the Limit of the meter’s ability to display the actual value at that range (not “open line”). If you had a 600v meter and attempted to read a 660vac line, the meter would display OL. It would be dangerous to think “Open Line” in this case as the reading on the display; because, it would still kill you if you if you touch it. Think ‘over limit’ instead. If the battery in your example circuit were 24v and you had your meter set on the 20v range, OL would be displayed. But, there is actually 24v accross those two points (I.e., the voltage drop across the open switch equals the voltage rise of the source).
Hey Brian, I really appreciate your videos. Your teaching style fits how I learn perfectly. I just found out you guys are in CFL and so am I. I’m currently a sales tech doing mostly IAQ and new unit sales, I only do light repair work rn. These videos have helped me a lot with those repairs. I would love to come help out for free on Sundays if you guys work those days. I just applied to the company as the kind lady on the phone told me that would be the best way to get in contact with you. I applied as an install helper. Would love to come help out on my day off with whatever you guys need.
Awesome class!! Thank you! Is there any site from which we can download or purchase the entire 200 slides presentation ? I would love to see the full content :)
I was listening to your podcast between calls and in one about gas and combustion you guys are discussing buildup/flaking of the inside of copper tubing? I live in Ontario and I See this sometimes in service and quite often in installation when removing old equipment (25+ sometimes the line is 35 years or older) and the line is still gas tight, mind you seriously work hardened. In service it's worse on LP but seems to happen on both NG and LP and it's not actually going to be an issue until someone hits the line & with no dirt pocket. i see it happen alot on fireplaces - might go into the gas valve, and people wonder why their fireplace flame is only a gentle blue rumble after rennovations in the living room 😅 Fireplaces that are 25 to 35 years or older, with a 3/8 gas line will shale bad enough around that age, ive seen it actually have enough of a static pressure drop to drop out the pilot when the burner is turned on. It would probably happen with larger size tubing too eventually, but i have yet to see it be a problem on 1/2" copper or bigger. and it can change flame appearance very slowly, over those years blowing out the line with compressed air once in the two decades can fix it. wrapping copper when passing thru and strapping against masonry has long been code here and no coastal salt todeal with, also galvanized is illegal - we see a ton of black iron, req. painted outdoors & CSST. I like copper because its cheap, effective and time tested. Only specified legal method of leak detection here is soap and dial, which make infractions based on electronic detection sketchy at best. Love the podcast man just want ed to leave my 2 cents.
Ill admit most folks dont maintain a fireplace long enough/often enough or use it often enough to have it get old enough for it to even be a topic of discussion lol. but we could knock out a cup full of flakes from 3 feet of tubing in some places! Its real man its not a conspiracy!
I hope this question makes sense: can someone please explain why there is less resistance when a motor is seized up? Wouldn’t it be more resistance impeding the path of the current trying to close circuit because it’s not turning freely making it harder or more resistant to turn? When he specified that we should understand resistance as the inverse of logical common sense way of thinking (like friction), I missed the explanation explaining why we should understand it that way.
The resistance is the same when a motor starts up that is seized or not seized. That is called locked rotor amps as there is massive current flow in both the rotor and the stator for a short period of time until the rotor gets up to normal speed. Then, there is back EMF that effectively increases resistance. You are conflating different type of resistance… If you understood that an induction motors speed is determined by frequency and poles, not voltage, this would all make more sense…
I'm not 100% sure what u are asking but, if u have an overload than the breaker would trip. So if u have a breaker rated for 20 amps and u overload it( putting to many loads on that breaker) and it begins to draw 20.5 amps or 21 amps, that the breaker would trip...
@@TacoDaddy-mr8ig Thank you for taking the time for that question. More what I meant is this; In ohms law if you increase resistance then you've decreased current, so if an overload is excess Resistance then wouldn't that decrease current and the breaker would never trip?
@@nathanj.williams1955 actually with an overload, the resistance would go down and a lot more current would flow therefore the breaker would trip.. think about the word ' overload ' OVER(to many) LOAD ( HAIR DRYERS) so, if u have to many loads, than the current draw will increase and cause the breaker to trip..
@@TacoDaddy-mr8ig on a parallel circuit an overload would decrease Resistance which I think I understand now. Thank you very much man for helping me there.
Overload means your load is drawing too much current due to a technical malfunction. This means we are talking LESS resistance, which ia why more current is suddenly able to flow through the load. Overload is NOT increased resistance. Think of it this way: if the system is functioning properly all its parameters (Voltage, Current and Resistance) are well-balanced. When this balance is disturbed this is when things go wrong. Overcurrent means increased current due to strain or voltage drop (in motors, pumps, etc.). More current is drawn and is able to pass through the appliance because resistance has dropped and it should not otherwise have happened. Hope this makes it a bit clearer.
Is it true that in alternating current electricity comes from the grid through the live wire and go back via the neutral wire. But why do you have a spark(short circuit) when you directly connect live and neutral, isn't the electricity supposed to just alternate between the wires? Just wondering
The neutral wire is only neutral in relation to L1 and L2; which is why we have split single phase, not two phase as some people incorrectly assert. You can still get shocked from the neutral…
“Something isn’t happening that should be happening” is an open, but what about voltage drop? Is that not as much of an issue in a/c circuits as it is in d/c?
So,...If I understand the question sir,..while voltage drop is an inherent phenomenon in both AC and DC circuits, its manifestation and implications differ significantly between the two. AC circuits present unique challenges due to impedance, reactance, skin effect, and proximity effect, making voltage drop a complex consideration in AC system design and analysis, particularly in high-frequency applications and power transmission systems. Understanding these nuances is essential for optimizing circuit performance and ensuring efficient power delivery in AC systems.
@@johnnyreb280 thank you for your explanation. Voltage drop testing as I’m describing on a DC is using a voltage measurement at the load. The result of a voltage reading lower than designed would reveal the presence of resistance in the circuit that should not be present if the circuit is in tact. For example, if I’m testing at a vehicle headlight and I’m measuring less than battery voltage, assuming the design calls for that, I might suspect corrosion in a connector. Is such a testing method appropriate with a AC system we might find in a commercial building or even a home? I’m curious if it might help speed up diagnostic testing on equipment specifically if one were to record voltages themselves while the equipment was operating correctly if that information was lacking. I see a lot of part swapping and guessing in a place I frequent. It seems wasteful in both parts and labor. One instance a board was suspected and was going to be ordered because a fuse was blowing. I quickly inspected the circuit and found a short. The board was expensive and unnecessary. I inquired about the voltage drop testing and it hadn’t been heard of. The subject of PWM came up because it’s used in the newer equipment and I asked which scope they use. Same result, I explained PWM too as it was unknown. It was odd to me because I see all the above daily in automotive diagnostics. That led me to the question I asked above. I know very little about AC systems and was curious if the nature of the AC system somehow rendered the test unreliable. I don’t see how it would be though on a piece of equipment that has fixed loads.
Alternating current has dozens of voltage drops per second, research root mean squared and you will understand… But, that type of voltage drop is not what you were really asking about… Yes, there is voltage drops in AC, but you generally wind up with other issues before you would notice the changes from a power drop - like smoke or fire from overheating wires…
Nice presentation! Just one little correction, on your water analogy diagram for Terms, you have Watts (Work), and it should be Watts (Power). Work (Energy) = Power X Time.
When you add additional resistive components to a circuit, the total resistance decreases. Just wanted to clear that up in case anyone was confused about that
There is one error in the "Terms" slide. "Watts" are power, which is the rate of doing work. "Energy" is equivalent to "work" and is power integrated over time.
I have to ask: WHY does electrical resistance drip if physical resistance increases? I understand the inverse relationship between resistance and current, but I don’t get how physical resistance decreases electrical resistance. Edit: I get the example given with the heat strip, but the example of rough bearings slowing a motor or something similar, I don’t get how that reduces electrical resistance.
A spinning rotor in an energized motor generates back-EMF in the stator, which has the effect of lowering the voltage that the motor "sees," or you can think of it as increased electrical resistance. This why there is a current surge when a motor is turned on. The current drops as the motor approaches its working speed.
At time 1:02:33 you said a capacitor stores a charge in an electromagnetic field, which is very wrong. A capacitor stores a charge in an electric field..
8:40 I have to reject your opinion because saying who said Amp is the killer is silly. Amp kills you directly. Vol is a factor but still not a killer in a main way.
Yes, you can. This is why: The voltage difference - one half volt - is negligible. It’s only ~2.5%. The laptop’s charge management circuitry will cope with that just fine. The current difference only refers to the peak amount of current that the charger can supply at the rated voltage - 5 amps at 20 volts. Your laptop will not be using the full, available 5 amps from the charger. The laptop only uses what it needs. However, the POLARITY of the voltage at the connector, which plugs into your laptop, is absolutely CRITICAL. If it matches with the polarity of the old charger, (for example, the center pins on both are positive) then it should be fine. If the polarity is opposite, be prepared for a bit of smoke, and a trip to the store to buy a new laptop... Good luck sir..
He was talking about 3 identical light bulbs, which all have the same resistance, and since the voltage across each light bulb is the same, the current through each light bulb is also the same. But you're right, current might not be the same depends on the resistance of each load.
Yes... Because unlike a standard breaker that trips at the rated amperage, a G.F.C.I would trip at much lower currents , maybe up to 5 milliamps it would trip..
Thank you for the interesting topic. 💙💙💙
I'm 33 and I have my first day as an electrical apprentice next week. This was very helpful. Thank you!
Good luck bro!
I’m considering changing to electrical at 35
Good luck!! 🤘🏽
How did you get in ? What’s the name of the company
You r so old man, try weaving
Such a honor listening to you
I send your videos to my 23 year old son getting his feet wet in the hvac industry
Been doing for 30 years and I have tremendous respect of your skill and knowledge
Thankyou so much
From bulletville Chicago
At least I know other Goodfellas are out there looking and learning. Chicago 15 years Downtown 👍
This guy is an excellent teacher I learned a lot I'm 62
I have a BS and MS in electrical and computer engineering and I find this tutorial very informative. good job sir
你是中国人吗
I'm just going to
AND ™¢🎉
8Pin clipboard items to stop them expiring after 1 hour
Sha❤
Engineers always f*ing things up for the mechanics that actually have to install and service 😅
I was repairing a Microwave oven and got shocked by the capacitor and it stopped my heart. It had been unplugged for a week. I lost consciousness and woke up on the floor.
The sudden stop when my butt hit the floor started my heart again. Discharge your capacitors with gloves on.
Sounds frightening thanks for the tip
What was it rated?
@@armandodeleon5047
I’d give it 1 star, do not recommend trying again
You should change your name to lucky
I wish you were teaching classes like this when I was younger ...youre an excellent teacher and you actually made me laugh ....
..thank you
Doesn’t matter how you get the point across or what illustrations you used to do that, the point is that people understand what you’re teaching them , don’t ever let anybody tell you anything different you don’t apologize for the way you teach ever. Just keep doing what you’re doing brother.😎🇺🇸🪖👍
I never regret a sec to subscribe in this channel
Do you really?
Neither do I ! 👍🏻🍺
This is my favorite subscription by far. Ive relearned things I had forgotten and been set straight on things I thought I already knew for years. It will make you a much better troubleshooter.
I'm a hobbyist age 21 from South Africa and the video is awesome
keep it up bro.
Time for me to toss out my grandfathers DIY book on basic electricity and break out a copy of Macbeth. That was a nice mix of information and humor. Great stuff.
I would express the utmost gratitude for sharing this content with the universe of inquiring minds. This is how we expand consciousness by enlightening each other through science informed education with a personal human touch via the internet of things 🙏
I’m a student, these explanations makes really easy to understand electricity, I know it is not exactly like that, but it’s enough to be introduced. Thanks
I’m 30 years old. I have 3+ years in the elevator industry down in Florida. This information is helping me out a lot.
Thanks very much for the detailed explanations. This feels like a fairly comprehensive introduction to me! I am a homeowner gearing up to DIY some electrical conduit in my new garage workshop, and I wanted to brush up on what I learned in high school physics with a new focus on working with electricity safely. I'm glad I found your channel; I think this video was just the ticket!
Thanks so much. You are the best instructor I have seen in my age.
Personally, I understand very well when you teach more than my teacher of high school. Keep it up!!
1:12:30 - The most fascinating magic in electronics, to me is how you can open and close a switch to a coil really fast and get more voltage out than the applied voltage (e.g., high- and low-side MOSFETs on a laptop motherboard).
You are a great teacher man! I usually have to watch videos about 3 times just to start understanding everything in the video. You teach me something new and then go further with explanations and stories and relating them to things i understand completely and it sticks. Love it man i didnt even start trade school yet but i feel like im ahead with these videos^
thank you for posting this. it is very helpful. watching all the way from the philippines.
You're an excellent teacher --- .great lesson! 👍
On the short VS open, let’s not forget the whole “ we have a brown out” customer interchangeable word. Love it!
Everyone had a dope ass teacher like this at some point in their lives, keeps it fun but extremely knowledgeable. That Edison joke was great 😂
44:19 - “As you were, Sir!” OL means Over Limit or Outside the Limit of the meter’s ability to display the actual value at that range (not “open line”). If you had a 600v meter and attempted to read a 660vac line, the meter would display OL. It would be dangerous to think “Open Line” in this case as the reading on the display; because, it would still kill you if you if you touch it. Think ‘over limit’ instead. If the battery in your example circuit were 24v and you had your meter set on the 20v range, OL would be displayed. But, there is actually 24v accross those two points (I.e., the voltage drop across the open switch equals the voltage rise of the source).
Got a good chuckle out of me with the "long circuit" you snuck in there!
Great info and video thank you 40 years in the DC side of stuff.
This is a very explanatory and insightful video.
I really wish I can like it twice
Hey Brian, I really appreciate your videos. Your teaching style fits how I learn perfectly. I just found out you guys are in CFL and so am I. I’m currently a sales tech doing mostly IAQ and new unit sales, I only do light repair work rn. These videos have helped me a lot with those repairs. I would love to come help out for free on Sundays if you guys work those days. I just applied to the company as the kind lady on the phone told me that would be the best way to get in contact with you. I applied as an install helper. Would love to come help out on my day off with whatever you guys need.
Thinking about getting into the field. Incredible video/page. Thank You
This is great, a very interesting and informative lesson, thank you.
That sparky handbook is gold
Hell of a teacher.
Thanks!
im tryna learn from everthing you teach from here on out
Listening to you around the 11:20 mark reminded me of first learning to do arc flash calculations; which I still hate doing to this day…
How tall is the tower, what is the pipe diameter, what is the weight of the fluid, and what is the demand?
great video I'm in school for hvac right now and this cleared things up.
Thank you for the course
Super informative and awesome illustrations and examples.
Hey, thanks a lot! It was awesome and I learned so many new things. Keep up the great work!
Não sei nada de inglês, mas vou ver anotando pela tradução; com certeza vou aprender muito. Obrigado.
his explanation is very clear.
7:40 lands on dad joke attempt! It was a great attempt man, tough crowd as usual!
In all seriousness, this is a great video! Thank you for this!
Awesome class!! Thank you!
Is there any site from which we can download or purchase the entire 200 slides presentation ? I would love to see the full content :)
I was listening to your podcast between calls and in one about gas and combustion you guys are discussing buildup/flaking of the inside of copper tubing? I live in Ontario and I See this sometimes in service and quite often in installation when removing old equipment (25+ sometimes the line is 35 years or older) and the line is still gas tight, mind you seriously work hardened. In service it's worse on LP but seems to happen on both NG and LP and it's not actually going to be an issue until someone hits the line & with no dirt pocket. i see it happen alot on fireplaces - might go into the gas valve, and people wonder why their fireplace flame is only a gentle blue rumble after rennovations in the living room 😅
Fireplaces that are 25 to 35 years or older, with a 3/8 gas line will shale bad enough around that age, ive seen it actually have enough of a static pressure drop to drop out the pilot when the burner is turned on. It would probably happen with larger size tubing too eventually, but i have yet to see it be a problem on 1/2" copper or bigger. and it can change flame appearance very slowly, over those years blowing out the line with compressed air once in the two decades can fix it. wrapping copper when passing thru and strapping against masonry has long been code here and no coastal salt todeal with, also galvanized is illegal - we see a ton of black iron, req. painted outdoors & CSST. I like copper because its cheap, effective and time tested. Only specified legal method of leak detection here is soap and dial, which make infractions based on electronic detection sketchy at best. Love the podcast man just want ed to leave my 2 cents.
Ill admit most folks dont maintain a fireplace long enough/often enough or use it often enough to have it get old enough for it to even be a topic of discussion lol. but we could knock out a cup full of flakes from 3 feet of tubing in some places! Its real man its not a conspiracy!
Great examples of electric path
Extremely informative and you make it easy to grasp thank you 😊
Thank you!!! Very useful video and teacher.
Thanks for the video. Put in timestamps please.
I hope this question makes sense: can someone please explain why there is less resistance when a motor is seized up? Wouldn’t it be more resistance impeding the path of the current trying to close circuit because it’s not turning freely making it harder or more resistant to turn?
When he specified that we should understand resistance as the inverse of logical common sense way of thinking (like friction), I missed the explanation explaining why we should understand it that way.
The resistance is the same when a motor starts up that is seized or not seized. That is called locked rotor amps as there is massive current flow in both the rotor and the stator for a short period of time until the rotor gets up to normal speed. Then, there is back EMF that effectively increases resistance. You are conflating different type of resistance… If you understood that an induction motors speed is determined by frequency and poles, not voltage, this would all make more sense…
If I find a hot wire from the attic and I hook a bunch of LED lights to it one right after around the perimeter the that's a series circuit, isn't it?
Detailed explanation about electrical basics
Great class, good info. Thanks Bryan.
Excellent information.
Amazing lecture! Tank You.
On the test, would you assume to derate for conduit fill? 3 or more conductors?
Could you explain a circuit overload please. Since increased resistance from over "load" should decrease amperage then why does the breaker trip?
I'm not 100% sure what u are asking but, if u have an overload than the breaker would trip. So if u have a breaker rated for 20 amps and u overload it( putting to many loads on that breaker) and it begins to draw 20.5 amps or 21 amps, that the breaker would trip...
@@TacoDaddy-mr8ig Thank you for taking the time for that question. More what I meant is this; In ohms law if you increase resistance then you've decreased current, so if an overload is excess Resistance then wouldn't that decrease current and the breaker would never trip?
@@nathanj.williams1955 actually with an overload, the resistance would go down and a lot more current would flow therefore the breaker would trip.. think about the word ' overload ' OVER(to many) LOAD ( HAIR DRYERS) so, if u have to many loads, than the current draw will increase and cause the breaker to trip..
@@TacoDaddy-mr8ig on a parallel circuit an overload would decrease Resistance which I think I understand now. Thank you very much man for helping me there.
Overload means your load is drawing too much current due to a technical malfunction. This means we are talking LESS resistance, which ia why more current is suddenly able to flow through the load. Overload is NOT increased resistance. Think of it this way: if the system is functioning properly all its parameters (Voltage, Current and Resistance) are well-balanced. When this balance is disturbed this is when things go wrong. Overcurrent means increased current due to strain or voltage drop (in motors, pumps, etc.). More current is drawn and is able to pass through the appliance because resistance has dropped and it should not otherwise have happened. Hope this makes it a bit clearer.
Really interesting information honestly I went to advance for me! Thank you
Is it true that in alternating current electricity comes from the grid through the live wire and go back via the neutral wire. But why do you have a spark(short circuit) when you directly connect live and neutral, isn't the electricity supposed to just alternate between the wires? Just wondering
There's no load. In order to have a circuit a load is required or else wires burn ( if there was no breaker )
The neutral wire is only neutral in relation to L1 and L2; which is why we have split single phase, not two phase as some people incorrectly assert. You can still get shocked from the neutral…
“Something isn’t happening that should be happening” is an open, but what about voltage drop? Is that not as much of an issue in a/c circuits as it is in d/c?
So,...If I understand the question sir,..while voltage drop is an inherent phenomenon in both AC and DC circuits, its manifestation and implications differ significantly between the two. AC circuits present unique challenges due to impedance, reactance, skin effect, and proximity effect, making voltage drop a complex consideration in AC system design and analysis, particularly in high-frequency applications and power transmission systems. Understanding these nuances is essential for optimizing circuit performance and ensuring efficient power delivery in AC systems.
@@johnnyreb280 thank you for your explanation. Voltage drop testing as I’m describing on a DC is using a voltage measurement at the load. The result of a voltage reading lower than designed would reveal the presence of resistance in the circuit that should not be present if the circuit is in tact. For example, if I’m testing at a vehicle headlight and I’m measuring less than battery voltage, assuming the design calls for that, I might suspect corrosion in a connector. Is such a testing method appropriate with a AC system we might find in a commercial building or even a home? I’m curious if it might help speed up diagnostic testing on equipment specifically if one were to record voltages themselves while the equipment was operating correctly if that information was lacking. I see a lot of part swapping and guessing in a place I frequent. It seems wasteful in both parts and labor. One instance a board was suspected and was going to be ordered because a fuse was blowing. I quickly inspected the circuit and found a short. The board was expensive and unnecessary. I inquired about the voltage drop testing and it hadn’t been heard of. The subject of PWM came up because it’s used in the newer equipment and I asked which scope they use. Same result, I explained PWM too as it was unknown. It was odd to me because I see all the above daily in automotive diagnostics. That led me to the question I asked above. I know very little about AC systems and was curious if the nature of the AC system somehow rendered the test unreliable. I don’t see how it would be though on a piece of equipment that has fixed loads.
Alternating current has dozens of voltage drops per second, research root mean squared and you will understand… But, that type of voltage drop is not what you were really asking about… Yes, there is voltage drops in AC, but you generally wind up with other issues before you would notice the changes from a power drop - like smoke or fire from overheating wires…
@@EarlHayward thanks I appreciate your time answering.
Taught with love.
13:56 where can I find that book?
Nice presentation! Just one little correction, on your water analogy diagram for Terms, you have Watts (Work), and it should be Watts (Power). Work (Energy) = Power X Time.
When you add additional resistive components to a circuit, the total resistance decreases. Just wanted to clear that up in case anyone was confused about that
You mean when they are added in parallel.
@@GH-oi2jf yes, should have said parallel, good catch
There is one error in the "Terms" slide. "Watts" are power, which is the rate of doing work. "Energy" is equivalent to "work" and is power integrated over time.
So Enriching knowledge
Awesome class .
7:28 I thought that if a motor was seized, that would INCREASE resistance in that circuit, therefore reduce the current draw?... 🤔
Decreased resistance = higher current
Look at ohms law
Very good teacher!
so great...interesting topic
Thank you so much. I love these videos
VERY GOOD !!!
This video is like drinking from a fire hydrant
You could say it's... High Amperage 🥴
From this EE, excellent!
If u have one thing in a circuit, it is a series circuit because it has one path...
I have to ask: WHY does electrical resistance drip if physical resistance increases? I understand the inverse relationship between resistance and current, but I don’t get how physical resistance decreases electrical resistance.
Edit: I get the example given with the heat strip, but the example of rough bearings slowing a motor or something similar, I don’t get how that reduces electrical resistance.
A spinning rotor in an energized motor generates back-EMF in the stator, which has the effect of lowering the voltage that the motor "sees," or you can think of it as increased electrical resistance. This why there is a current surge when a motor is turned on. The current drops as the motor approaches its working speed.
Very good lesson!
Electricity takes the path with lest resistance sir haven’t you seen the case of lockouts?
Hey guys of HVAC SCHOOL, how can I contact you besides this video and its chat?
Nice Lecture !
The water analogy for electrical circuits is very close to the mark, so to is a pneumatic control circuit
Yea they definitely have limitations but the get you probably 90% there.
Thank you.
Can I come learn with you?
Know what to be the best in the Electrical field never skip the basic's/ tip from senior's Electrician.👷😎👍👌👍🥇🤝⚡⚡then👷🍺🍺🍻🍻🥃🥃
What a great guy
At time 1:02:33 you said a capacitor stores a charge in an electromagnetic field, which is very wrong. A capacitor stores a charge in an electric field..
8:40 I have to reject your opinion because saying who said Amp is the killer is silly. Amp kills you directly. Vol is a factor but still not a killer in a main way.
Hi a little help here, can I use 20v 7.7a charger for 19.5v 3.3a laptop?. Thank you
Yes, you can. This is why:
The voltage difference - one half volt - is negligible. It’s only ~2.5%. The laptop’s charge management circuitry will cope with that just fine.
The current difference only refers to the peak amount of current that the charger can supply at the rated voltage - 5 amps at 20 volts. Your laptop will not be using the full, available 5 amps from the charger. The laptop only uses what it needs.
However, the POLARITY of the voltage at the connector, which plugs into your laptop, is absolutely CRITICAL. If it matches with the polarity of the old charger, (for example, the center pins on both are positive) then it should be fine. If the polarity is opposite, be prepared for a bit of smoke, and a trip to the store to buy a new laptop...
Good luck sir..
@@TacoDaddy-mr8ig thanks 👍
If u have one thing in a circuit, it is a series circuit because it has one path... 😮
Thanks 👍
Thank you for I learned a lot
Had 75mgb was ok I guess? Like your class
EXCELLENT INSTRUCTOR
Holy shit that is some rockstar teacher behavior I live.
Nice lecture
Ay time 1:10:43 - 1:10:44 u said the current in a parallel circuit is the same. Thats not 100% true, unless the are all the same..
He was talking about 3 identical light bulbs, which all have the same resistance, and since the voltage across each light bulb is the same, the current through each light bulb is also the same. But you're right, current might not be the same depends on the resistance of each load.
Wait so a gfci can actually save lives?
Yes... Because unlike a standard breaker that trips at the rated amperage, a G.F.C.I would trip at much lower currents , maybe up to 5 milliamps it would trip..
Watching 👀 #PowerLearningChannel
I don’t know how people studied HVAC alone before your videos