**DISCLAIMER - READ BEFORE WATCHING** I am an electronics hobbyist; I do not have a degree in electrical engineering. This series MAY NOT teach all of the appropriate safety required for general electronics work. Any advice taken from this series should be checked with multiple sources, and a professional should be addressed to ensure proper safety.
UA-cam has taught me more on several subjects than school ever did. Your videos are one of those reasons. Easy to get into, informative, well presented, with visual aids. Loving these videos, dont ever stop.
Very true. It boggles my mind looking back how school did not teach us things we'd encounter every day such as electronics, but makes us learn physics, chemistry, etc. You want electronics? Go to vocational school. LOL!
When I was little, I used to tinker with nerf guns and see how far I could get them to shoot. Around the time I really got into doing that, they came out with a few semi-automatic ones that used motors to propel the darts like a ball pitching machine. I got a couple of those to see what I could get out of them, not knowing much at all about electronics. They took about 4 AA batteries each. I decided to hook up 2 9 volt batteries to one and burnt out the resistors for the motors. After those burnt out, I just wired the motors without them. They made one hell of a noise and shot really far until I burnt them out. Afterward, I used motors from a different model nerf gun with the same configuration (no resistors) those one's never burnt out and still shot as far. I also wired in my own power switch, since the original was a button you had to hold down. Only vaguely related to the video, but I figured someone might get a kick out of the story
Get the Nerf Nuke. Here's another fun story, I googled how to make a nuclear bomb and it said I needed to start with calc-based physics. However, the FBI and teachers were concerned because, back in those internet days that was worse than googling R-rated movies. It put me on a watch list until 9/11 happened and they had more important things to do. From here I deduce that learning calc-based physics will put you on a watch list.
Thank you, man. I am a university technical English instructor working in Germany, and next term I will need to teach the Electrical Engineering students some subject-related English. I had no idea of any electronics, so these videos are tremendously helpful for me to create decent lessons that won't bore these people to death!
Thank you for doing a well illustrated tutorial Being Dyslexic and its getting worse with old age, I personally struggle with books and putting knowledge from such into practice. And so from watching this tutorial, I do now understand and now it seems simple. This old dog has learned a new trick so to speak :)
Just a slight clarification for those who are struggling to get the forward voltage part: forward voltage more or less means how much energy the diode uses up. Forward voltage is how many less volts we'll have in the circuit after the diode, as opposed to before it. So to find out how much voltage we have in the circuit as a whole, we need to subtract that number from the source, or else we would be overestimating. This also mean that if we have more than one LED (or other component), all we have to do is plug in their forward voltage into the equation, and it will tell us how much less resistance we need.
So, if I'm understanding this correctly, let's say we have a 9v battery and three LEDs that take up to 3v each. Would using all three LEDs in a circuit eliminate the need for any resistors? And would having a fourth LED cause them all to glow less brightly due to the shared voltage being more spread out?
Been wondering how to get into electronics.. I work in an R&D company but I only do the mechanical side of things, housings, brackets etc.. I already "know'' by experience on the workplace alot of the stuff you are explaning, but only as seperate pieces of information. Your videos are really helpfull into letting all of it come together and make sense :) Thanks alot!
lol you know ive been trying to find a video like this for years. Like maybe at least 7 years. That formula makes so much sense to me. It finally clicked in my head and now I finally understand how and what the goal is on designing a circuit. I am forever grateful thank you. I swear ive looked so hard for an easy explanation and I never could find it.
Thank you for sharing your knowledge. Deeply appreciated! I'm a Linux user and I love the idea of sharing knowledge for the betterment of mankind and technology...
I really like how you instruct. This tutorial series is simple and clear, and that's exactly what people like me need. Thank you for all your hard work and efforts. You are awesome sauce!
I am on lesson 8 now and your material is sooooo good! This knocks spots off of the way that they teach at college, I know as that is where I labouriously learned in a year what I could have learned in 6 weeks with the proper method of teaching.
I work as a journeyman in the commercial and residential electrical field. I know nothing of electronics and I'm seeing applications in my field that, if I knew basic electronics, this will take me much farther in my career. Fun videos.
Thank you man!! This is amazing, honestly, I spent years at school understanding NOTHING about electricity because all we get is a diagram and I didn't even know what most things even meant in it. in English (since I am foreign and study in a UK school), and the way for me to learn is to understand how everything goes together, and you showing us everything and explaining is literally all I need to learn stuff like that, it's sad that schools don't really always teach us like that.. but thank you!!
very good I am happy to see your video . I don't know how much resistance use in Ckt. my request please prepared video for how much capacitor, transistor, diode, resistance rating use in circuit.
Yes. If you add resistors in series (one after another) you can combine their individual resistances together to get a total resistance value. 120 + 120 = 240 ohm. Two resistors of 120 ohms combined together in series are equivalent to (or the same as) one resistor of 240 ohms.
You have the best tutorials on electronics, you explain very well and easy to understand, and you cover the important things, you're amazing. Liked and subbed 🖒🖒
what if we are using 1k resister which ~4 times of required one, would it blow the LED or if we use 100 resistance which is less then half, I am bit confused on if 240 is blocking or 240 releasing. which case would release more current ?
When you have a resitor of say, 100 ohm, that is too low. Can you put two resistors after eachother to get already 200ohms? I am a total novice to it. Just thought about this during you said 100 ohms is too low.
Bro, this series tutorial on basic electronics is really great! This would help me a lot in taking my Physics 2 class next week. Have to finish this series before our first class starts 🤣 thank you very much! God Bless you!
I am a Mechanical Engineer, Trying to learn Electronics, Thanks a lot for your information.. i have 1 one doubt.. resistor can be connected to cathode or anode of LED ???
If we have a data sheet that shows forward voltage type (example: 1.7) and forward voltage max (example: 2.2), I take it we go by type (1.7) to work out the resistance? and Steady current (example 30 mA) would be for Amps(0.03 amps)? The component I'm looking to use is a 3 bit 7 segment led display and the power source is a 1.5 volt AAA battery
What if the forward voltage has a range, or is higher than the power source? Ex. I'm using 3V to light a 3.0-3.2V green LED. Depending on which value I use, my required resistance ends up being 0 or negative - so no resistor is needed?
Lower is only bad if it's too little to run the component. No resistor needed, if it doesn't work, you need higher voltage. This might be a bit late for answering this question, but maybe someone else with the same question will see this.
I am using 2 AA batteries. I got a electronics starter kit with absolutely no information about the LED. I am going to use the same numbers as you. But if I have 3 volt power source, I would get a negative number
Sometimes you do not need to add the forward voltage. I just did the same thing for a small motor and there was no Forward Voltage specified so I guess its only for LED's?
Hello, thank you for your lessons. But I do have a question. What if I need a resistor for 240 oms but I have only two resistors for 120 oms could I put them all in one current and would they sum up?
In your example, you said something like, "What if you only have a 100 ohm resistor . . ." so I'm wondering, can you wire two resistors in sequence to create, in effect (in this example), a 200 ohm resistor?
I have a power source of 19.5 and amps of 6.7. There is no known forward voltage differential as the power is moving into a coil of copper wire. So if i divide it all out, I end up with about 3 ohms. My question is in regard to the watts that are being put out which is about 130 watts. When choosing a resistor, do I take the wattage output into consideration and if so, how do I calculate that in?
Just curious... Let's say you have a 24v power source and you want to power a gadget or let's say a laptop with a forward voltage of 19v; Would the laptop work by adding a resistor to the 24v power source?
Im watching your videos to brush up/from scratch electronics, I have a light led fixture and its toooo bright but I want to dim it down but tge power supply is not dimmable so I thought I was smart so I figured how much voltage could it be on the load side 100-150vdc yikes, so know im trying to find a way to dim it after the power supply I was thinking to just put a ristor or potentiometer but is it really that simple
For this resistance example of 240 ohms, what would be a minimum and maximum cut off value for the amount of resistance? Like how much would be too much resistance and how less would be too little resistance..?
I love your videos, I had one question if you don't mind. let's say you wanted to hook up another LED or some other component after the current passes through the resistor and the light. If it continues down the wire does it remain at the changed voltage or does it rise again? I hope I worded that right.
So if i have multiple components in a circuit say an led and a speaker do i do the calculation for the next component with the source minus forward voltage as my new source for the component so (new source - forward voltage) / amps used by component
if I wanna add this is a car what voltage should I use a 12vwhen the car is off or 14v when it's on and what about the power of the resistor doesn't it matter.
There's a problem here for many of us, I buy those little plastic boxes of mixed LEDs of various colours from the likes of Amazon and although it tells you on the lid the forward voltage there is no mention of how many amps each colour LED uses. So what do you do in those circumstances??
Thank you so much for the video. Can i use multi-meter to know forward voltage and amps for LEDs if i don't know the manufacturer or the forward voltage and amperage?. Do I need 2 resistors if I have 2 LED lights or i can use one resistor? Also what if the resistance so high like 500 ohms?
what about the amps of the power supply ay i have a 12 v dc power supply which boasts of a 1 am current ho are we going to incorporate that in calculating the resistance required please guide
why is no one answering this question? i read every single comment and a bunch of people are asking this. if i have a 9v battery pushing way more current how does that factor in? youd obviously need much higher resistance, but this part is nowhere in the formula and i cant find an explanation for this anywhere. how can the current of the power source be totally ignored when calculating resistance?
So if I have a power supply that pushes 30v and 10amps dc right. and my device wants 30v and 1.3 Amps .How do i stop it from drawing 5amps at 30v? because it gets hot and starts to draw more and more . Than it sends more amps because of heat. I can cool it and it helps alot. But the problem is still there how do i stop it from drawing more amps as it heats up?
why is no one answering this question? i read every single comment and a bunch of people are asking this. if i have a 9v battery pushing way more current how does that factor in? youd obviously need much higher resistance, but this part is nowhere in the formula and i cant find an explanation for this anywhere. how can the current of the power source be totally ignored when calculating resistance?
Don't we need to consider power source's output power? Doubt: if we have 2 sources S1 & S2. S1 = 9v/1A S2 = 9v/2A Then also we need the same resistance to work with same LED.
Out of curiosity, would you be able to compound resistors to equal 240 ohms? For example, use two 100 ohm and one 40 ohm resistors. I'm sure this isn't optimal but if you had to is it possible? If not, why is that?
*Summary:* - some electrical components (e.g. LEDs) can only handle so much current going through them, any more and they will be damaged - you know how much voltage your circuit has, but how much resistance should you add to the circuit to ensure that the LED (or other sensitive component) does not get damaged? - use this formula: (circuit_voltage - component_forward_voltage) / component_current
**DISCLAIMER - READ BEFORE WATCHING**
I am an electronics hobbyist; I do not have a degree in electrical engineering. This series MAY NOT teach all of the appropriate safety required for general electronics work. Any advice taken from this series should be checked with multiple sources, and a professional should be addressed to ensure proper safety.
UA-cam has taught me more on several subjects than school ever did. Your videos are one of those reasons. Easy to get into, informative, well presented, with visual aids. Loving these videos, dont ever stop.
Very true. It boggles my mind looking back how school did not teach us things we'd encounter every day such as electronics, but makes us learn physics, chemistry, etc. You want electronics? Go to vocational school. LOL!
yeah, like writing checks.
forward voltage = the amount of voltage needed to get current to flow across a diode.
So like is it the minimum amount of voltage for the current to overcome the resistance within it?
@@VSHEGDE1947 nah. That's just the minimum amount of current you need to light up a LED. Simple
@@Yash-qs8iu So if my power source outputs at 3.2V I could light up my LED without having to place a transistor first?
I don't understand how I can get the value of a forward voltage
@@izuchisharon2769 you ask in the store or view it online idk, i think there's no way to know it unless you ask or view it somewhere
When I was little, I used to tinker with nerf guns and see how far I could get them to shoot. Around the time I really got into doing that, they came out with a few semi-automatic ones that used motors to propel the darts like a ball pitching machine. I got a couple of those to see what I could get out of them, not knowing much at all about electronics. They took about 4 AA batteries each. I decided to hook up 2 9 volt batteries to one and burnt out the resistors for the motors. After those burnt out, I just wired the motors without them. They made one hell of a noise and shot really far until I burnt them out. Afterward, I used motors from a different model nerf gun with the same configuration (no resistors) those one's never burnt out and still shot as far. I also wired in my own power switch, since the original was a button you had to hold down. Only vaguely related to the video, but I figured someone might get a kick out of the story
Great story!
Get the Nerf Nuke. Here's another fun story, I googled how to make a nuclear bomb and it said I needed to start with calc-based physics. However, the FBI and teachers were concerned because, back in those internet days that was worse than googling R-rated movies. It put me on a watch list until 9/11 happened and they had more important things to do. From here I deduce that learning calc-based physics will put you on a watch list.
Cool story
@@bradleybeauclair8282 is this true😯😰
@@omkarbansode6305 yes, I recall these days, but I never got caught, my teachers just threatened to punish who did it
Thank you, man. I am a university technical English instructor working in Germany, and next term I will need to teach the Electrical Engineering students some subject-related English. I had no idea of any electronics, so these videos are tremendously helpful for me to create decent lessons that won't bore these people to death!
Thank you for doing a well illustrated tutorial
Being Dyslexic and its getting worse with old age, I personally struggle with books and putting knowledge from such into practice.
And so from watching this tutorial, I do now understand and now it seems simple.
This old dog has learned a new trick so to speak :)
Just a slight clarification for those who are struggling to get the forward voltage part: forward voltage more or less means how much energy the diode uses up. Forward voltage is how many less volts we'll have in the circuit after the diode, as opposed to before it. So to find out how much voltage we have in the circuit as a whole, we need to subtract that number from the source, or else we would be overestimating.
This also mean that if we have more than one LED (or other component), all we have to do is plug in their forward voltage into the equation, and it will tell us how much less resistance we need.
So, if I'm understanding this correctly, let's say we have a 9v battery and three LEDs that take up to 3v each. Would using all three LEDs in a circuit eliminate the need for any resistors? And would having a fourth LED cause them all to glow less brightly due to the shared voltage being more spread out?
BoomTownWhale good point. Will be waiting for an answer as i am confused
Good question boomtown whale. I await an answer aswell
@@hatt_man thats what i was thinking! Waiting for the response now :(
Still waiting for a reply 2 years later.
Been wondering how to get into electronics..
I work in an R&D company but I only do the mechanical side of things, housings, brackets etc.. I already "know'' by experience on the workplace alot of the stuff you are explaning, but only as seperate pieces of information.
Your videos are really helpfull into letting all of it come together and make sense :) Thanks alot!
lol you know ive been trying to find a video like this for years. Like maybe at least 7 years. That formula makes so much sense to me. It finally clicked in my head and now I finally understand how and what the goal is on designing a circuit. I am forever grateful thank you. I swear ive looked so hard for an easy explanation and I never could find it.
Thank you for sharing your knowledge. Deeply appreciated! I'm a Linux user and I love the idea of sharing knowledge for the betterment of mankind and technology...
thank you for not saying "btw i use Arch"
As a hobbyist myself who is still on a learning journey I am very impressed with how well presented and clear this is.
I really like how you instruct. This tutorial series is simple and clear, and that's exactly what people like me need. Thank you for all your hard work and efforts. You are awesome sauce!
I am on lesson 8 now and your material is sooooo good! This knocks spots off of the way that they teach at college, I know as that is where I labouriously learned in a year what I could have learned in 6 weeks with the proper method of teaching.
I work as a journeyman in the commercial and residential electrical field. I know nothing of electronics and I'm seeing applications in my field that, if I knew basic electronics, this will take me much farther in my career. Fun videos.
You are a truly gifted teacher. A rare gift.
I'm a bit of an electronic wizard I'm my family and I'm trying to teach my 8 year old brother and this series is helping heaps thanks allot
this is one of the best videos i ha ve ever seen , keep doing what you doing but my question is what is the forward voltage in this equation .
+Ali Khan In my case there is a 3.2V forward voltage, meaning it is the recommended (by the manufacturer) voltage the component needs to run properly.
CodeNMore ñ
how the manufacturer knows 3.2v fv
Thank you man!! This is amazing, honestly, I spent years at school understanding NOTHING about electricity because all we get is a diagram and I didn't even know what most things even meant in it. in English (since I am foreign and study in a UK school), and the way for me to learn is to understand how everything goes together, and you showing us everything and explaining is literally all I need to learn stuff like that, it's sad that schools don't really always teach us like that.. but thank you!!
u helped me understand how to calculate resistors more than my teacher did, thankss
Greeeat! I was worried from the previous videos that the equation was going to be harder but you made it look easy. Thank you
Thanks for keeping this simple and understandable.
THANKS SO MUCH for all these tutorials. You're a great teacher.
Very good and easy to understand explanation of resistance.
I took electronics in college and this is such s nice refresher lol
I'm glad - thanks for the comment!
U explained like its our cup of tea!thanks man..u r the best teacher!
I really liked the way u teach like learner friendly!
Love the great breakdowns of info to make it simple. Keep up the good work and thanks again for sharing info.
very good
I am happy to see your video . I don't know how much resistance use in Ckt.
my request please
prepared video for how much capacitor, transistor, diode, resistance rating use in circuit.
Can you add 2 resistors togather and add their resistence up?
Like 2x 120 Ohm resistors for this LED
Thank you for this video! But I have one little question. If u need a 240ohm resistor but u only have two 120ohm resistors, can u combine them?
Yes. If you add resistors in series (one after another) you can combine their individual resistances together to get a total resistance value. 120 + 120 = 240 ohm. Two resistors of 120 ohms combined together in series are equivalent to (or the same as) one resistor of 240 ohms.
very simple to understand brother thank you so much for this great help . one step closer to building my bluetooth controller
I will sure but that if I sell that on market😃
You have the best tutorials on electronics, you explain very well and easy to understand, and you cover the important things, you're amazing. Liked and subbed 🖒🖒
Would you need a resistor each LED you use?
btw i love this series helps tons.
+shakira deleon we'll cover this in the episode on series/parallel circuits (soon to come).
okay thanks :)
Great question!
Hi ... I understood everything except how can we determine the amps our electronic component require or take? ? please could you explain me .. !! :)
forward voltage is the voltage which is used up by the whole ysytem (including, more led's, resistors, and switches..etc.) right?
Yes! I googled it and it is the voltage needed to flow across a diode (a circuit with two terminals) (ex: a batterry has two sides)
I always thought forward voltage was the electrical energy capacity an object can contain.
Thank you so much for the video!
how do you find the forward voltage and amps of components that you did not order?
what if we are using 1k resister which ~4 times of required one, would it blow the LED or if we use 100 resistance which is less then half,
I am bit confused on if 240 is blocking or 240 releasing. which case would release more current ?
very very nicely explained. thanks for that. what a great support that is! Keep it up CodeN!
Can you use more than one resister in a row to make it right?
When you have a resitor of say, 100 ohm, that is too low. Can you put two resistors after eachother to get already 200ohms? I am a total novice to it. Just thought about this during you said 100 ohms is too low.
Actually, I was asking myself the same....
this man IS THE MAN
Bro, this series tutorial on basic electronics is really great! This would help me a lot in taking my Physics 2 class next week. Have to finish this series before our first class starts 🤣 thank you very much! God Bless you!
so lucky to have found these videos. great job
I am a Mechanical Engineer, Trying to learn Electronics, Thanks a lot for your information.. i have 1 one doubt.. resistor can be connected to cathode or anode of LED ???
you explained this better than my professor, thank you
If we have a data sheet that shows forward voltage type (example: 1.7) and forward voltage max (example: 2.2),
I take it we go by type (1.7) to work out the resistance?
and Steady current (example 30 mA) would be for Amps(0.03 amps)?
The component I'm looking to use is a 3 bit 7 segment led display
and the power source is a 1.5 volt AAA battery
What if the forward voltage has a range, or is higher than the power source?
Ex. I'm using 3V to light a 3.0-3.2V green LED. Depending on which value I use, my required resistance ends up being 0 or negative - so no resistor is needed?
Lower is only bad if it's too little to run the component. No resistor needed, if it doesn't work, you need higher voltage.
This might be a bit late for answering this question, but maybe someone else with the same question will see this.
Great lesson! You made resistance really simple!
The best video about electronics that was awesome! so bright....
I am using 2 AA batteries. I got a electronics starter kit with absolutely no information about the LED. I am going to use the same numbers as you. But if I have 3 volt power source, I would get a negative number
Very informative!
Sometimes you do not need to add the forward voltage. I just did the same thing for a small motor and there was no Forward Voltage specified so I guess its only for LED's?
Hello, thank you for your lessons. But I do have a question. What if I need a resistor for 240 oms but I have only two resistors for 120 oms could I put them all in one current and would they sum up?
In your example, you said something like, "What if you only have a 100 ohm resistor . . ." so I'm wondering, can you wire two resistors in sequence to create, in effect (in this example), a 200 ohm resistor?
If forward voltage is the amount the led uses then what is amps for?
I have a power source of 19.5 and amps of 6.7. There is no known forward voltage differential as the power is moving into a coil of copper wire. So if i divide it all out, I end up with about 3 ohms. My question is in regard to the watts that are being put out which is about 130 watts. When choosing a resistor, do I take the wattage output into consideration and if so, how do I calculate that in?
Just curious...
Let's say you have a 24v power source and you want to power a gadget or let's say a laptop with a forward voltage of 19v;
Would the laptop work by adding a resistor to the 24v power source?
Im watching your videos to brush up/from scratch electronics, I have a light led fixture and its toooo bright but I want to dim it down but tge power supply is not dimmable so I thought I was smart so I figured how much voltage could it be on the load side 100-150vdc yikes, so know im trying to find a way to dim it after the power supply
I was thinking to just put a ristor or potentiometer but is it really that simple
For this resistance example of 240 ohms, what would be a minimum and maximum cut off value for the amount of resistance? Like how much would be too much resistance and how less would be too little resistance..?
To run your LED off a 120v wall plug I'd need a resister rated at 4866 ohm, aka 5kohm?
I love your videos, I had one question if you don't mind.
let's say you wanted to hook up another LED or some other component after the current passes through the resistor and the light. If it continues down the wire does it remain at the changed voltage or does it rise again? I hope I worded that right.
So if i have multiple components in a circuit say an led and a speaker do i do the calculation for the next component with the source minus forward voltage as my new source for the component so (new source - forward voltage) / amps used by component
I have a question for multiplying of the MA and trying to find out whats the AMP for it do I always multiple the number by .001
A question - if you connect two 100 ohms resistors to the circuit, one after the other - does that create a 200 ohms resistance?
Hey if in the datasheet of my LEDS are a Typ. and a Max. Collumn of the Forward Voltage, which one do i need?
What about when you use a coin cell battery (3V) to power a 3.2V LED? Does that mean that your battery doesn’t do the job?
Good clear explanation. Thank you.
How do you find the amps? Is it called the “continuous forward current” on the Datasheet?
What about if you don't have the information about your component telling you what the forward voltages is ?
Please forgive my ignorance. If you use a resistor greater than what is needed, would that then starve the component of electricity?
My LEDs were bought from Amazon and I can't find any information about the LEDs AMPs. How can this be found without manufacturers info?
I am new follower of your channel. It's help me very much
What if I have 2 120ohm resistors? Can I hook them both up in sequence instead of using a single 240ohm resistor?
if I wanna add this is a car what voltage should I use a 12vwhen the car is off or 14v when it's on and what about the power of the resistor doesn't it matter.
Very Helpful. thank you for the knowledge
There's a problem here for many of us, I buy those little plastic boxes of mixed LEDs of various colours from the likes of Amazon and although it tells you on the lid the forward voltage there is no mention of how many amps each colour LED uses. So what do you do in those circumstances??
I love your videos .You are really great.Your videos are awesome and this one made my day😍😍😍
Thank u very much😊😊😊
This exactly what I was look for. Thank you
Thank you so much for the video. Can i use multi-meter to know forward voltage and amps for LEDs if i don't know the manufacturer or the forward voltage and amperage?. Do I need 2 resistors if I have 2 LED lights or i can use one resistor? Also what if the resistance so high like 500 ohms?
So when dividing the 5.8v by the 0.024 amps I got 241.666667. So when you rounded you did if for the nearest value of 10?
what about the amps of the power supply ay i have a 12 v dc power supply which boasts of a 1 am current ho are we going to incorporate that in calculating the resistance required
please guide
why is no one answering this question? i read every single comment and a bunch of people are asking this. if i have a 9v battery pushing way more current how does that factor in? youd obviously need much higher resistance, but this part is nowhere in the formula and i cant find an explanation for this anywhere. how can the current of the power source be totally ignored when calculating resistance?
someone pleeeease explain this. its the only part i dont understand
if youre not a teacher you should be, never learned it this easy in school
Good job codenmore
Your videos are really fantastic
Would it be better to round up or down the ohm value of the resistor you’re going to use when trying to find the next best one?
Is there any other way how to get forward voltage and amps? I have LEDs, but I don't have any documentation.... soooo... I am lost... pls help
So if I have a power supply that pushes 30v and 10amps dc right. and my device wants 30v and 1.3 Amps .How do i stop it from drawing 5amps at 30v? because it gets hot and starts to draw more and more . Than it sends more amps because of heat. I can cool it and it helps alot. But the problem is still there how do i stop it from drawing more amps as it heats up?
why is no one answering this question? i read every single comment and a bunch of people are asking this. if i have a 9v battery pushing way more current how does that factor in? youd obviously need much higher resistance, but this part is nowhere in the formula and i cant find an explanation for this anywhere. how can the current of the power source be totally ignored when calculating resistance?
i responded to the wrong person. lol
you are an atd awsome teacher diod
Is the resistance additive?
i.e. would two 120 ohms resistors in serial equal the requisite 240 ohms?
My LEDs don't have their Amp value, all I have is their voltage. Can I assume the Amp is a similar value to a different supplier?
Don't we need to consider power source's output power?
Doubt: if we have 2 sources S1 & S2.
S1 = 9v/1A
S2 = 9v/2A
Then also we need the same resistance to work with same LED.
My school sucks and doesn't teach me anything. BUT THIS 10/10
is there only two ways to come to know that one leg is anode and one is cathode or there may be some other ways for different led's
What if you have a mixed bag of old components? How would you figure out the manufacturer?
Out of curiosity, would you be able to compound resistors to equal 240 ohms? For example, use two 100 ohm and one 40 ohm resistors. I'm sure this isn't optimal but if you had to is it possible? If not, why is that?
good explaination. do you have related books to your explaination for sell
If you need 200 ohms or resistance and you only have 100 ohms resistors can you combine two 100s in your circuit?
*Summary:*
- some electrical components (e.g. LEDs) can only handle so much current going through them, any more and they will be damaged
- you know how much voltage your circuit has, but how much resistance should you add to the circuit to ensure that the LED (or other sensitive component) does not get damaged?
- use this formula: (circuit_voltage - component_forward_voltage) / component_current
when i asked the sales woman about the resistor she asked how much watts? though they only have 1 watts. is it safe to use this resistor?
Great teaching chops.