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How to Measure DC Voltage and Current in a Parallel Resistor Circuit 

Clyde Lettsome, PhD, PE
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In the video I demonstrate how to measure voltage and current in a resistor circuit where the resistors are in parallel. This is a very common activity performed in a Electricity and Magnetism Physics Lab.
If you have problems seeing the resistance placement in this video, you may watch this video • Simulated Circuit Set ... for additional explanation. The video has simulated series, parallel and combination circuit connection on a proto-typing board.
Note: To ask questions, please visit my site at clydelettsome....

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29 сен 2024

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Комментарии : 110   
@9337Synthesizer
@9337Synthesizer 6 лет назад
Thanks a million man. I've been measuring amps wrong for about an hour, you really helped out.
@shixu1998
@shixu1998 3 года назад
This video helped me alot.
@CALettsomePhDPE
@CALettsomePhDPE 3 года назад
Great! Happy to hear that it helped. Please like, share, and subscribe.
@fasihulhaq8223
@fasihulhaq8223 5 лет назад
sir very nice
@knowledgetown8176
@knowledgetown8176 2 года назад
Thanks sir
@alexanderaparicio9653
@alexanderaparicio9653 5 лет назад
This is helping me a lot, but IDK why.. But I have 12 volt in and out and 2 resistors of 100 ohms and when I connect the 12 volts to the parallel circuit for some reason the voltage drop to 1.276 or some other number
@CALettsomePhDPE
@CALettsomePhDPE 5 лет назад
Hi Alexander, This is a tough question to answer without knowing all of the information related to your circuit. With the limited information that I do know, it sounds like the switch is not only a switch or perhaps the charger has a significant amount of resistance relative to the two resistors in parallel. You will need to check: 1. What the output resistance/impedance of the charger. You may be able to get this by looking at the specifications written on the charger or finding the specifications for the charger online. 2. Obtain the datasheet for the switch and see if there is more to the switch, meaning are there other components in the switch. You will need to obtain the datasheet for the switch to know this. I hope this makes sense. Good Luck!
@doomcriticalzx6554
@doomcriticalzx6554 4 года назад
Ah yes of course 🤔🍷
@CALettsomePhDPE
@CALettsomePhDPE 4 года назад
LIke, Share, Subscribe.
@konosxatz1
@konosxatz1 7 лет назад
When measuring the current,can't you,instead of putting another wire where the second "leg" was,just put the multimeter cables on both "legs" of the resistance?
@henriquefrank3186
@henriquefrank3186 7 лет назад
No, it will burn the multimeter fuse, because it's in parallel and will make a short circuit
@lakshanperera372
@lakshanperera372 7 лет назад
No - You can't do this because the multimeter must be in series with the circuit when taking measurements of current. However you can place the multimeter across both legs when measuring voltage.
@mdooz6058
@mdooz6058 2 года назад
Thank you so much! My professor didn't explain anything for the labs and I've been stumped!
@alexsaura8254
@alexsaura8254 3 года назад
Gotta say this helped me so much for my lab, greatly appreciated!
@CALettsomePhDPE
@CALettsomePhDPE 3 года назад
Glad it helped! Please like, share, and subscribe.
@subhaskmandal4904
@subhaskmandal4904 3 года назад
You are a very good teacher. Thanks.
@fearlessbay5183
@fearlessbay5183 8 лет назад
Thank you so much! This was really helpful !! I finally understand how to do this
@daisymonsalve1485
@daisymonsalve1485 4 года назад
Cheers for the Video! Forgive me for the intrusion, I would appreciate your opinion. Have you thought about - Runayslarn Survival Manifestation (probably on Google)? It is a good exclusive guide for discovering how to repair your electronic items without the hard work. Ive heard some awesome things about it and my old buddy Taylor after a lifetime of fighting got cool results with it.
@ajae4616
@ajae4616 8 месяцев назад
Have a question? What is the purpose of removing the other end of the resistor to a different hole when checking current?
@AerisYong-kz4pk
@AerisYong-kz4pk 2 месяца назад
To break the circuit
@AerisYong-kz4pk
@AerisYong-kz4pk 2 месяца назад
so that all electrons flowing through the circuit must also go through the ammeter
@aminatahir9788
@aminatahir9788 3 года назад
Aye just thank u so much 🥰 Why don't our lab instructors teach this way? 😭
@CALettsomePhDPE
@CALettsomePhDPE 3 года назад
Happy to help. Please like, share, and subscribe.
@alexandrabarajas5939
@alexandrabarajas5939 4 года назад
Thank you Thank you!! I have lab tomorrow and I feel way more confident.
@CALettsomePhDPE
@CALettsomePhDPE 4 года назад
Wonderful! Please share, like, and subscribe.
@momsy61
@momsy61 3 года назад
Thank you very much, that was so helpful !! My son had a report due and this saved him !!
@CALettsomePhDPE
@CALettsomePhDPE 3 года назад
Awesome! Glad it was helpful. Like, Share, and Subscribe.
@residentgomez
@residentgomez 2 года назад
I can't see what you're doing. I wished you focused in a little more.
@mohanvamsi1180
@mohanvamsi1180 5 лет назад
Sir the main thing you do is using less space to make an experiment so if you find a good space and make the video it wouldn't be more clumsy so make sure you have good space About the explanation part, you are really awesome so that I got a belief that I can rock the exam tomorrow thank you sir.
@CALettsomePhDPE
@CALettsomePhDPE 5 лет назад
Thank you for the advice. Like, Share, Subscribe.
@Luftbubblan
@Luftbubblan 8 лет назад
Do it get this right? A resistor is used to control Current? If so, is there a way to get higher current later on in a circuit again? I thought it would control the Volt value hehe.
@funnyvideos-qs9vm
@funnyvideos-qs9vm 7 лет назад
resistor control current in parallel.. resistor control voltage in series..
@mrnarason
@mrnarason 8 лет назад
Thanks, very easy to understand and straightforward.
@ashirahsan3611
@ashirahsan3611 5 лет назад
thanks a lot for explaining the concept. You have surely helped a lot of people
@CALettsomePhDPE
@CALettsomePhDPE 5 лет назад
Great! Like, Share, Subscribe! CAL
@oOKoyaanisqatsiOo
@oOKoyaanisqatsiOo 3 года назад
Thank you very much! you have solved a problem i'm looking for our an our!!!! no one talks of this on internet
@CALettsomePhDPE
@CALettsomePhDPE 3 года назад
Glad I could help. Please like, share and subscribe.
@jordynprobst8778
@jordynprobst8778 3 года назад
jeeesssss. I have been trying to figure this our for 2 hours!!! Thank you!!!!
@CALettsomePhDPE
@CALettsomePhDPE 3 года назад
Glad I could help! Please like, share an subscribe.
@shhsnnan__72829-
@shhsnnan__72829- 2 года назад
hi. i have a question. when measuring current how do you know how to remove the resistor to measure current? this is bad wording sorry. like sometimes you removed it and left the end jn the open, ither times you moved it a space down. does it result in the same current?
@hirasohail9205
@hirasohail9205 6 лет назад
Sir why do we need to break the circuit to measure current?
@mperez7974
@mperez7974 5 лет назад
the ammeter shorts the resistor. The current will go through the path of least resistance (the ammeter) so you must break the circuit in order to avoid that.
@humaidalqubaisi9194
@humaidalqubaisi9194 5 лет назад
@@mperez7974 you seem to know about this subject ,,, so why would that give any different results than using Ohms Law ? Thank you .
@ericstandefer9138
@ericstandefer9138 4 года назад
@@humaidalqubaisi9194 it should not.
@pickledjesus517
@pickledjesus517 7 лет назад
thank you so much !! took me forever to find a video like this.
@Tnapvrvideo
@Tnapvrvideo 5 лет назад
I am in the infancy stage of Electronics 101. To this point, I need a major clarification on battery voltage. I want to use a 12V battery with a breadboard to closer simulate the 15 volts across the rails on a HO scale track .... My confusion: .... You see many of these tiny, rectangular, 9V batteries being used with breadboards. A riding lawn mower typically has a 12V battery which is considerably larger than the tiny, rectangular 9V battery, yet the voltage comparison is 9V to 12V. Adding to my confusion is a 12V car battery which has the same 12V rating as the riding lawn mower battery, yet the car battery is quite a bit larger and heavier. What am I missing that differentiates between these voltage readings: 9V rectangular battery versus 12V mower battery versus 12V car battery. Thanks!!!
@CALettsomePhDPE
@CALettsomePhDPE 5 лет назад
Hi MK Outdoor Adventures, thanks for watching. To ask questions, please go to my website clydelettsome.com and look for the "Ask the Expert" link. That is where I address questions. I typically use this area of RU-vid for comments from viewers. Thanks again.
@kamrankhankami7793
@kamrankhankami7793 4 года назад
oh thank you man, very nice explained...
@CALettsomePhDPE
@CALettsomePhDPE 4 года назад
Thank you. Please like, share, and subscribe.
@amanshah7780
@amanshah7780 4 года назад
Thank you very much sir 🙏🏻🙏🏻
@CALettsomePhDPE
@CALettsomePhDPE 4 года назад
You are welcome. Please like, share, and subscribe.
@aodhmacraynall8932
@aodhmacraynall8932 5 лет назад
What caused the electricity to run backwards in that second one?
@CALettsomePhDPE
@CALettsomePhDPE 5 лет назад
Hi Aodh! Sorry for the confusion. I am not sure what you mean by run backward. If you mean decreased, that can happen sometimes when the connection is not good and there is a temporary loss of connectivity between components or the multimeter. If you mean change direction (a change from positive to negative or negative to positive), that will only happen if the electricity is AC. I hope this helps. If I did not answer your question, please go to www.clydelettsome.com/blog/ask-the-expert/ and post your question there for a more detail answer. Thanks. Like, subscribe, and share.
@aodhmacraynall8932
@aodhmacraynall8932 5 лет назад
@@CALettsomePhDPEThanks, I watched again and I've got it now. My mistake.
@NewChannelSwitch
@NewChannelSwitch 2 года назад
I wish my Robotics teacher taught like you 😭
@harambeslilbro3673
@harambeslilbro3673 3 года назад
thank you for real your videos helped
@xBACONxLUV3Rx
@xBACONxLUV3Rx 5 лет назад
IDK if anyone can answer this but whenever I measure the current I'm getting the same current though out all the resistors.
@CALettsomePhDPE
@CALettsomePhDPE 5 лет назад
The only way theoretically that the currents should be the same is if all the resistors in parallel are the exact same value. In a real world experiment if all the parallel resistors are the same value, they will have approximately the same current.
@vuqiis2778
@vuqiis2778 Год назад
Thank you so much!! You saved me
@cintrahabbogaming5672
@cintrahabbogaming5672 5 лет назад
Thanks. Sir im in my first 10 grade and i like to learn more about electric please do more videos on ohms kirchoff lows
@anneoni691
@anneoni691 2 года назад
Thank you for your detailed video.
@fayeezullah9628
@fayeezullah9628 6 лет назад
i cant understand where you broke the wire and where you placed it again
@donaldschoolcraft1353
@donaldschoolcraft1353 5 лет назад
Great video! Thank you !
@CALettsomePhDPE
@CALettsomePhDPE 5 лет назад
Your welcome! Subscribe and share!
@Muhammad-kc6nb
@Muhammad-kc6nb 4 года назад
THANK YOU SO MUCH
@CALettsomePhDPE
@CALettsomePhDPE 3 года назад
You're welcome! Like, Share, and Subscribe!
@shahzaibmanzoor6933
@shahzaibmanzoor6933 6 лет назад
Thank u soo much i was ao confused but u cleared everything very nicely
@abelongskiii
@abelongskiii 2 года назад
Thank you so much Sir.
@syedjunaidkhalid1011
@syedjunaidkhalid1011 6 лет назад
How did you connect the voltage supply? I dont see any wires going in
@Zawhomafu
@Zawhomafu 8 лет назад
Bless you
@cagmito76
@cagmito76 4 года назад
Thanks just helped me out a lot .
@CALettsomePhDPE
@CALettsomePhDPE 4 года назад
No problem 👍 Like, Share and Subscribe!
@cagmito76
@cagmito76 4 года назад
@@CALettsomePhDPE done
@Sanjanaudemkadi
@Sanjanaudemkadi 4 года назад
Thanks 😊
@CALettsomePhDPE
@CALettsomePhDPE 4 года назад
You are welcome! Like share and subscribe.
@temahtegu3971
@temahtegu3971 6 лет назад
Why is ur negative wire (black) measured in the positive side Or I'm I wrong 🤷‍♀️🤔
@hymavathi7134
@hymavathi7134 6 лет назад
My doubt also that please tell me
@GurpreetKaur-xe3hp
@GurpreetKaur-xe3hp 5 лет назад
It was a jumper cable only.
@ericstandefer9138
@ericstandefer9138 4 года назад
Great job!!
@CALettsomePhDPE
@CALettsomePhDPE 4 года назад
Thank you. Like, Share, and Subscribe.
@amijubaer4197
@amijubaer4197 5 лет назад
Sorry sir but how can i know where to put these registers?
@CALettsomePhDPE
@CALettsomePhDPE 5 лет назад
Hi Ami, thank you for asking your question. I believe these videos may be helpful. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-gHBqJJQAaOs.html and ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-PGy9ankRawk.html
@tonycoke123
@tonycoke123 7 лет назад
Dont put your fingers in the circuit
@eleazarcantu2990
@eleazarcantu2990 5 лет назад
Where can i get a breadboard like the one you have?
@CALettsomePhDPE
@CALettsomePhDPE 5 лет назад
A number of companies sell similar boards. You may try Amazon, Digi-key, or Mouser for starters.
@عليناصر-د3س
@عليناصر-د3س 6 лет назад
Thank you I wish very much for you
@MohammadMahadiHassain
@MohammadMahadiHassain 8 лет назад
Thank you
@thikychikystiky
@thikychikystiky 3 года назад
great video, thanks Doc
@CALettsomePhDPE
@CALettsomePhDPE 3 года назад
Very welcome. Please like, share and subscribe.
@АлиханБолат-ф6п
@АлиханБолат-ф6п 5 лет назад
Why voltages were egual to each other
@CALettsomePhDPE
@CALettsomePhDPE 5 лет назад
Parallel components have the same voltage across them. This video may help ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-u3wkDyqCXU0.html .
@knowledgeboy6137
@knowledgeboy6137 4 года назад
Thanks sir. Nice explain
@CALettsomePhDPE
@CALettsomePhDPE 4 года назад
You are welcome. Please like, subscribe and share.
@hadi4183
@hadi4183 6 лет назад
7.12 for current
@NMD7499
@NMD7499 6 лет назад
life saver thank you!
@menriheimang
@menriheimang 5 лет назад
How to measure total current?
@CALettsomePhDPE
@CALettsomePhDPE 5 лет назад
Total current is I1 + I2 + I3 or you can break the circuit after the power supply. You can then test for total current at the break. If this does not make sense submit a question on my website. See this video (ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-N_vqCYHPlkc.html) to understand how to do this.
@inkbledsmurfett
@inkbledsmurfett 7 лет назад
this really helped thanx
@lakyomari6278
@lakyomari6278 8 лет назад
thank you ^_^
@dreamerxxxc
@dreamerxxxc 9 лет назад
It's difficult to see where you broke the circuit for the current measurement. It's also difficult to see where you place the wire. It's difficult to actually see where you measured the wire and the resistor. Could you please please fix this part of the video. You explain it the best but the visual is blocked by your hand or by glare. ! Help
@adelelamrani9245
@adelelamrani9245 6 лет назад
Why is your polarity negative
@hamzajamal5661
@hamzajamal5661 6 лет назад
Because the wires are oppositely connected, meaning positive with negative and the negative with the positive.
@EricWW2
@EricWW2 6 лет назад
He held the prongs on the opposite sides. That's why he had -5V. Still correct just point of view
@sanchezdaniel8480
@sanchezdaniel8480 5 лет назад
Good video now i have a better understanding and I also like to know you I did ur board like that with those terminals neat
@jungbyunghyukilpumconsulti556
@jungbyunghyukilpumconsulti556 7 лет назад
I made 2ohm 10ohm resistors and 10Volt circuit. When I connected only to a 10ohm resistor, it burned out. Why is it?
@ferozwaseem3468
@ferozwaseem3468 5 лет назад
What happened to his thumb?
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