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

  Переглядів 296,476

Clyde Lettsome, PhD, PE

Clyde Lettsome, PhD, PE

9 років тому

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.com/blog/ask-th...

КОМЕНТАРІ: 108
@9337Synthesizer
@9337Synthesizer 6 років тому
Thanks a million man. I've been measuring amps wrong for about an hour, you really helped out.
@mdooz6058
@mdooz6058 Рік тому
Thank you so much! My professor didn't explain anything for the labs and I've been stumped!
@alexsaura8254
@alexsaura8254 3 роки тому
Gotta say this helped me so much for my lab, greatly appreciated!
@CALettsomePhDPE
@CALettsomePhDPE 3 роки тому
Glad it helped! Please like, share, and subscribe.
@subhaskmandal4904
@subhaskmandal4904 2 роки тому
You are a very good teacher. Thanks.
@mrnarason
@mrnarason 8 років тому
Thanks, very easy to understand and straightforward.
@fearlessbay5183
@fearlessbay5183 8 років тому
Thank you so much! This was really helpful !! I finally understand how to do this
@daisymonsalve1485
@daisymonsalve1485 3 роки тому
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.
@alexandrabarajas5939
@alexandrabarajas5939 3 роки тому
Thank you Thank you!! I have lab tomorrow and I feel way more confident.
@CALettsomePhDPE
@CALettsomePhDPE 3 роки тому
Wonderful! Please share, like, and subscribe.
@momsy61
@momsy61 3 роки тому
Thank you very much, that was so helpful !! My son had a report due and this saved him !!
@CALettsomePhDPE
@CALettsomePhDPE 3 роки тому
Awesome! Glad it was helpful. Like, Share, and Subscribe.
@aminatahir9788
@aminatahir9788 3 роки тому
Aye just thank u so much 🥰 Why don't our lab instructors teach this way? 😭
@CALettsomePhDPE
@CALettsomePhDPE 3 роки тому
Happy to help. Please like, share, and subscribe.
@syedjunaidkhalid1011
@syedjunaidkhalid1011 6 років тому
How did you connect the voltage supply? I dont see any wires going in
@ashirahsan3611
@ashirahsan3611 4 роки тому
thanks a lot for explaining the concept. You have surely helped a lot of people
@CALettsomePhDPE
@CALettsomePhDPE 4 роки тому
Great! Like, Share, Subscribe! CAL
@shahzaibmanzoor6933
@shahzaibmanzoor6933 5 років тому
Thank u soo much i was ao confused but u cleared everything very nicely
@anneoni691
@anneoni691 Рік тому
Thank you for your detailed video.
@pickledjesus517
@pickledjesus517 7 років тому
thank you so much !! took me forever to find a video like this.
@mohanvamsi1180
@mohanvamsi1180 4 роки тому
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 4 роки тому
Thank you for the advice. Like, Share, Subscribe.
@jordynprobst8778
@jordynprobst8778 2 роки тому
jeeesssss. I have been trying to figure this our for 2 hours!!! Thank you!!!!
@CALettsomePhDPE
@CALettsomePhDPE 2 роки тому
Glad I could help! Please like, share an subscribe.
@zacharpetrynec2712
@zacharpetrynec2712 7 років тому
Bless you
@oOKoyaanisqatsiOo
@oOKoyaanisqatsiOo 3 роки тому
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 роки тому
Glad I could help. Please like, share and subscribe.
@ajae4616
@ajae4616 3 місяці тому
Have a question? What is the purpose of removing the other end of the resistor to a different hole when checking current?
@kamrankhankami7793
@kamrankhankami7793 4 роки тому
oh thank you man, very nice explained...
@CALettsomePhDPE
@CALettsomePhDPE 4 роки тому
Thank you. Please like, share, and subscribe.
@fayeezullah9628
@fayeezullah9628 6 років тому
i cant understand where you broke the wire and where you placed it again
@NMD7499
@NMD7499 6 років тому
life saver thank you!
@cintrahabbogaming5672
@cintrahabbogaming5672 5 років тому
Thanks. Sir im in my first 10 grade and i like to learn more about electric please do more videos on ohms kirchoff lows
@inkbledsmurfett
@inkbledsmurfett 6 років тому
this really helped thanx
@shhsnnan__72829-
@shhsnnan__72829- Рік тому
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?
@vuqiis2778
@vuqiis2778 Рік тому
Thank you so much!! You saved me
@Luftbubblan
@Luftbubblan 7 років тому
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 років тому
resistor control current in parallel.. resistor control voltage in series..
@donaldschoolcraft1353
@donaldschoolcraft1353 4 роки тому
Great video! Thank you !
@CALettsomePhDPE
@CALettsomePhDPE 4 роки тому
Your welcome! Subscribe and share!
@dreamerxxxc
@dreamerxxxc 8 років тому
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
@abelongskiii
@abelongskiii 2 роки тому
Thank you so much Sir.
@eleazarcantu2990
@eleazarcantu2990 5 років тому
Where can i get a breadboard like the one you have?
@CALettsomePhDPE
@CALettsomePhDPE 5 років тому
A number of companies sell similar boards. You may try Amazon, Digi-key, or Mouser for starters.
@harambeslilbro3673
@harambeslilbro3673 2 роки тому
thank you for real your videos helped
@cagmito76
@cagmito76 3 роки тому
Thanks just helped me out a lot .
@CALettsomePhDPE
@CALettsomePhDPE 3 роки тому
No problem 👍 Like, Share and Subscribe!
@cagmito76
@cagmito76 3 роки тому
@@CALettsomePhDPE done
@alexanderaparicio9653
@alexanderaparicio9653 4 роки тому
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 4 роки тому
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!
@shixu1998
@shixu1998 2 роки тому
This video helped me alot.
@CALettsomePhDPE
@CALettsomePhDPE 2 роки тому
Great! Happy to hear that it helped. Please like, share, and subscribe.
@ericstandefer9138
@ericstandefer9138 4 роки тому
Great job!!
@CALettsomePhDPE
@CALettsomePhDPE 4 роки тому
Thank you. Like, Share, and Subscribe.
@sanchezdaniel8480
@sanchezdaniel8480 5 років тому
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
@Tnapvrvideo
@Tnapvrvideo 5 років тому
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 років тому
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 UKposts for comments from viewers. Thanks again.
@Muhammad-kc6nb
@Muhammad-kc6nb 3 роки тому
THANK YOU SO MUCH
@CALettsomePhDPE
@CALettsomePhDPE 3 роки тому
You're welcome! Like, Share, and Subscribe!
@thikychikystiky
@thikychikystiky 3 роки тому
great video, thanks Doc
@CALettsomePhDPE
@CALettsomePhDPE 2 роки тому
Very welcome. Please like, share and subscribe.
@amanshah7780
@amanshah7780 4 роки тому
Thank you very much sir 🙏🏻🙏🏻
@CALettsomePhDPE
@CALettsomePhDPE 4 роки тому
You are welcome. Please like, share, and subscribe.
@aodhmacraynall8932
@aodhmacraynall8932 4 роки тому
What caused the electricity to run backwards in that second one?
@CALettsomePhDPE
@CALettsomePhDPE 4 роки тому
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 4 роки тому
@@CALettsomePhDPEThanks, I watched again and I've got it now. My mistake.
@xBACONxLUV3Rx
@xBACONxLUV3Rx 4 роки тому
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 4 роки тому
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.
@user-go8qk1it2n
@user-go8qk1it2n 6 років тому
Thank you I wish very much for you
@MohammadMahadiHassain
@MohammadMahadiHassain 8 років тому
Thank you
@hirasohail9205
@hirasohail9205 5 років тому
Sir why do we need to break the circuit to measure current?
@mperez7974
@mperez7974 5 років тому
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 років тому
@@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 роки тому
@@humaidalqubaisi9194 it should not.
@fasihulhaq8223
@fasihulhaq8223 5 років тому
sir very nice
@knowledgeboy6137
@knowledgeboy6137 4 роки тому
Thanks sir. Nice explain
@CALettsomePhDPE
@CALettsomePhDPE 4 роки тому
You are welcome. Please like, subscribe and share.
@temahtegu3971
@temahtegu3971 6 років тому
Why is ur negative wire (black) measured in the positive side Or I'm I wrong 🤷‍♀️🤔
@hymavathi7134
@hymavathi7134 5 років тому
My doubt also that please tell me
@GurpreetKaur-xe3hp
@GurpreetKaur-xe3hp 4 роки тому
It was a jumper cable only.
@knowledgetown8176
@knowledgetown8176 2 роки тому
Thanks sir
@amijubaer4197
@amijubaer4197 4 роки тому
Sorry sir but how can i know where to put these registers?
@CALettsomePhDPE
@CALettsomePhDPE 4 роки тому
Hi Ami, thank you for asking your question. I believe these videos may be helpful. ukposts.info/have/v-deo/n3hzpYCBiHeSsKc.html and ukposts.info/have/v-deo/iHeqbZelooiS2J8.html
@ihearditinadream
@ihearditinadream 2 роки тому
I wish my Robotics teacher taught like you 😭
@jungbyunghyukilpumconsulti556
@jungbyunghyukilpumconsulti556 6 років тому
I made 2ohm 10ohm resistors and 10Volt circuit. When I connected only to a 10ohm resistor, it burned out. Why is it?
@Sanjanaudemkadi
@Sanjanaudemkadi 4 роки тому
Thanks 😊
@CALettsomePhDPE
@CALettsomePhDPE 4 роки тому
You are welcome! Like share and subscribe.
@hadi4183
@hadi4183 6 років тому
7.12 for current
@menriheimang
@menriheimang 5 років тому
How to measure total current?
@CALettsomePhDPE
@CALettsomePhDPE 5 років тому
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 (ukposts.info/have/v-deo/ho-npXmQf4adzJc.html) to understand how to do this.
@user-pj1vv9yq4u
@user-pj1vv9yq4u 5 років тому
Why voltages were egual to each other
@CALettsomePhDPE
@CALettsomePhDPE 5 років тому
Parallel components have the same voltage across them. This video may help ukposts.info/have/v-deo/rWOon3qwqHmJtmQ.html .
@lakyomari6278
@lakyomari6278 8 років тому
thank you ^_^
@adelelamrani9245
@adelelamrani9245 6 років тому
Why is your polarity negative
@hamzajamal5661
@hamzajamal5661 6 років тому
Because the wires are oppositely connected, meaning positive with negative and the negative with the positive.
@EricWW2
@EricWW2 5 років тому
He held the prongs on the opposite sides. That's why he had -5V. Still correct just point of view
@konosxatz1
@konosxatz1 7 років тому
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 років тому
No, it will burn the multimeter fuse, because it's in parallel and will make a short circuit
@lakshanperera372
@lakshanperera372 6 років тому
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.
@doomcriticalzx6554
@doomcriticalzx6554 3 роки тому
Ah yes of course 🤔🍷
@CALettsomePhDPE
@CALettsomePhDPE 3 роки тому
LIke, Share, Subscribe.
@ferozwaseem3468
@ferozwaseem3468 5 років тому
What happened to his thumb?
@tonycoke123
@tonycoke123 7 років тому
Dont put your fingers in the circuit
@residentgomez
@residentgomez 2 роки тому
I can't see what you're doing. I wished you focused in a little more.
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