This video was perfect for me! I was working a science lab that simply asked us to "measure the voltage and amperage" at different places, and I had no idea how! This was a lifesaver.
7 year old video and it saved me. Forgot how to measure current since I'm so use to doing it with a claclulator, saved me right before my midterm skills test
Re-establishing fundamentals for the Power PE after a few years of industry work and I found a video uploaded by an alumnus of Georgia Tech with a mind-blowing background. I am so glad that I found your ece videos because your videos truly shine in a sea of low-quality and/or unreliable educational materials.
As an add-on comment, to measure current, you can also measure the voltage drop at any resistor (assuming you know the precise value of the resistor), and apply the calculation V(drop)/resistance to compute the current. The voltage drop is the voltage going into the resistor minus the voltage coming out of the resistor. This requires two measurements - except for the last resistor. Since the last resistor has a voltage of zero at it's exit point, you can just measure the voltage going into it and then divide that by the resistor value to compute the circuit current. Using this method, you don't have to "break the circuit", rip out components, remember to move the test leads from the Amps input back to the Voltage inputs (resulting in blown multimeter fuses), etc. If measuring AC current, us the DC equivalent, Vrms for the voltage measurement.
Thanks a bunch! I just cannot keep this straight. I used my desktop DMM and couldn't get it to work then I switched to my handheld and followed this video and it worked. I switched back to my desktop DMM and it worked so I am guessing I had the measuring points wrong.
Have not done this stuff since I took some electronic classes back in the early 90's. Thanks for refreshing my memory! Where did the .05 volts go? Voltage drops across the three resistors added up to 4.95 volts. Resistor tolerance I guess.
Hi snippits75, Thanks for asking. Remember wires have resistance. Some of the 0.05 voltage will be dropped in the wires. In addition. There is some uncertainty related to the multimeter. This will account for the remainder of the of the 0.05 Volts. Like, share, and subscribe.
@@CALettsomePhDPE I forgot about the wire resistance. Thanks for pointing that out! Glad I watched this because I was about to blow a fuse on my meter. I need to measure the current going through some resistors coming off a four way rotary switch, so I can buy another rotary switch with the proper current rating. I forgot about lifting a leg!
hello sir, is it possible for me to reach out to you for help with a circuit? i have a very complex circuit on paper but i just cannot make an actual circuit out of it
Thank you for asking. The current has to go through the ammeter in order to determine the change in charge through the meter over a given period of time. I hope that helps. Please like, share and subscribe.
Does it matter at which point on the circuit you break to measure the current? ie can you measure the current of the circuit by breaking between the 5v input and the first resistor?
Hi Jason, Thanks for asking the question. Measuring voltage and current does not change. Measure voltage across a component (voltage drop) or at a point relative to ground. When measuring current break the circuit and measure the current at the break. This will give you the current at the point of the break. I have a few videos on my channel that may help. I hope that helps. CAL
Electrons flow from negative to positive. Despite this, we say current flows from positive to negative. It was a mistake made long ago but we (scientist, engineers, electricians, electronic techs,...... everyone) continue to use it.
Thank you so much for this video. It's EXACTLY what I was looking for. I have a midterm tomorrow and you've made me a lot more confident.
6 yrs ago. TONYA WE NEED A LIFE UPDATE
7 years later I am also watching for my mid 😅
9 years later and it is still helpfull
thx doc :)
This video was perfect for me! I was working a science lab that simply asked us to "measure the voltage and amperage" at different places, and I had no idea how! This was a lifesaver.
7 year old video and it saved me. Forgot how to measure current since I'm so use to doing it with a claclulator, saved me right before my midterm skills test
Re-establishing fundamentals for the Power PE after a few years of industry work and I found a video uploaded by an alumnus of Georgia Tech with a mind-blowing background. I am so glad that I found your ece videos because your videos truly shine in a sea of low-quality and/or unreliable educational materials.
Great Video. 7 Years old but still timely and very well done.
Thank you.
Please like, share, and subscribe.
Amazing, and really flawless explaination. Our teacher recommended us this video.
As an add-on comment, to measure current, you can also measure the voltage drop at any resistor (assuming you know the precise value of the resistor), and apply the calculation V(drop)/resistance to compute the current. The voltage drop is the voltage going into the resistor minus the voltage coming out of the resistor. This requires two measurements - except for the last resistor. Since the last resistor has a voltage of zero at it's exit point, you can just measure the voltage going into it and then divide that by the resistor value to compute the circuit current. Using this method, you don't have to "break the circuit", rip out components, remember to move the test leads from the Amps input back to the Voltage inputs (resulting in blown multimeter fuses), etc. If measuring AC current, us the DC equivalent, Vrms for the voltage measurement.
Thanks for the tip man
Such a great and very helpful instructional video...this helped me a ton to brush up on skills for my midterm (which with your help, I made 100!)
This literally saved me my god you made it so easy to understand
Thanks a bunch! I just cannot keep this straight. I used my desktop DMM and couldn't get it to work then I switched to my handheld and followed this video and it worked. I switched back to my desktop DMM and it worked so I am guessing I had the measuring points wrong.
Excellent video! Thank you very much for a wonderful and concise explanation.
Great explanation. Thanks for posting!
Good video , well-spoken .
Thank you kindly. Please like, share and subscribe.
This video helped me a lot! Thanks!
Have not done this stuff since I took some electronic classes back in the early 90's. Thanks for refreshing my memory!
Where did the .05 volts go? Voltage drops across the three resistors added up to 4.95 volts. Resistor tolerance I guess.
Hi snippits75,
Thanks for asking. Remember wires have resistance. Some of the 0.05 voltage will be dropped in the wires. In addition. There is some uncertainty related to the multimeter. This will account for the remainder of the of the 0.05 Volts.
Like, share, and subscribe.
@@CALettsomePhDPE I forgot about the wire resistance. Thanks for pointing that out!
Glad I watched this because I was about to blow a fuse on my meter. I need to measure the current going through some resistors coming off a four way rotary switch, so I can buy another rotary switch with the proper current rating. I forgot about lifting a leg!
Thank you so much. Highly appreciate it.
Outstanding explanation
Loved this video. Thank you so much for the help!!!
Glad it was helpful!
Please like, share, and subscribe.
Good Tutorial
Very helpful, thank you Professor.
Thankyou.It was helpful
Good demo, thanks for sharing!
This video saved me!
hello sir, is it possible for me to reach out to you for help with a circuit? i have a very complex circuit on paper but i just cannot make an actual circuit out of it
Very helpful!
Thank you so much .
You're most welcome.
Please share, like and subscribe.
Why did you have to break the circuit to calculate the current?
Thank you for asking. The current has to go through the ammeter in order to determine the change in charge through the meter over a given period of time.
I hope that helps.
Please like, share and subscribe.
thank you.
You're welcome!
Please like, share and subscribe.
what is the name of this component that is a plug allowing you to easly attach the multimeter to the breadboard? thanks
if i understand u, those are called binding posts
If the 3rd resistor wasn't connected, would u need a black jumper cable to connect it in series or no?
That’s what I needed to know today on my midterm and the teacher was being a bitch
Great video!
Does it matter at which point on the circuit you break to measure the current? ie can you measure the current of the circuit by breaking between the 5v input and the first resistor?
The current in a series circuit is the same at all points, so no it doesn't matter
very helpful
Thanks sir
How do I measure a Series and Parallel circuit? 2S4P?
I understand how to do the Voltage, but I am uncertain of the current on a 2S4P setup.
Hi Jason,
Thanks for asking the question. Measuring voltage and current does not change. Measure voltage across a component (voltage drop) or at a point relative to ground. When measuring current break the circuit and measure the current at the break. This will give you the current at the point of the break.
I have a few videos on my channel that may help.
I hope that helps.
CAL
Thanks Sir, helps so much :)
Thanks
In a series circuit it does not matter.
ok
thank you!!
It helps to put the video on 1.5 times speed to understand it hé
Current flows from negative to positive
Electrons flow from negative to positive. Despite this, we say current flows from positive to negative. It was a mistake made long ago but we (scientist, engineers, electricians, electronic techs,...... everyone) continue to use it.
Isn't R1 and R3 in parallel, not series? So this would be a series /parallel circuit
no, this is a legit series circuit.. R1 is coming from positive power . And the end of R1 is in the same row as the front leg of R2 and so on
Thank you!!
You're welcome!
Please like, share, and subscribe.
Thankyou sir
Thanks sir