Ohm's Law

Analyzing voltage and current in a circuit is a great place to start to understand what that circuit is doing. In this episode of “Adventures in Science,” we introduce the resistor and use it to help demonstrate Ohm’s Law.

This interesting law of physics was named after Georg Ohm, and states that the current between two points is directly proportional to the voltage across those two points: I = V/R

With a little bit of algebra, we can move the variables around and arrive at the more memorable: V = I x R

In the video, we demonstrate voltage and current in a fluid-based circuit, and show how a resistor acts like a piece of steel wool used to restrict the flow of water. We also construct a real circuit using a resistor, measure the voltage and current, and then calculate the resistance using Ohm’s Law.

The information in the video was inspired by the following tutorials:

I’ve gotten some good feedback on the previous tutorials, so thank you to everyone who commented! For this video, I put the “intuitive” demo first before touching any math, so hopefully that helps to make things clearer for students. What can be improved for episode 4?

[C.D.MusicProduction]

Got a physics exam on Monday. This video was a MASSIVE help with my revision! Thanks!

[datatheandroid]

I'm taking electronics for the first time in my life at uni, I'm so glad I found this channel, thank you so much.

[matt.baller]

Having not done any of this stuff since GCSEs (I'm now 34) but my new job being relevant, I'm learning from scratch - and this was a really useful video, thank you!

[kizunadragon]

This is a fundamental lesson in electrical engineering. Everyone should know this.

[jyotighai]

The water experiment with resistor (steel wool) is misleading. It shows that after adding resistance the current (water) will be different before and after the resistor. Whereas the current should be the same at any point in the series.

[dr.yahyaelewa]

Sir,
I honor you an OSCAR in teaching.
How great you are.
HATS LIFT UP.

[ExultedJustin]

Thank you so much for these videos on the basics. The text to visual representation is exactly how I learn and helps so much.

[Abdoolkasim]

Amazing. Big applause. Please keep posting more!!!
Thanks!!!

[lonelyicecream]

Who else had to watch this for their science lesson?

[jtoombs]

Current actually flows from negative to positive. Not important in your ohms law demo but vitally important when working with diodes, transistors and everything else in the electronics world. It's always a good idea to stick with the fundamental truths starting with the basic building blocks. Otherwise, very good explanation especially your use of water as I have often used as an example.

[psd]

Respected *Shawn Hymel* sir,
I am a student, and literally the way you have teached electricity and electromagnetism is infinite wonderful!❤️ You have given us knowledge in the best way which nobody has ever given to us!
In india, teachers don't teach us correctly, they just make. Us gulp the text written in the book.
I request you teacher Shawn hymel that please try to teach us more physics like that you did in past(electricity, electromagnetism)
I know making more such videos will take a lot of effort! But please try to help,
Please reply teacher🙏🙏🙏👍❤️😁

[Ambassador]

Good explained, after watching this video. I understood very well Current Electricity and Using Ohm's law. Thank you

[MewsDabest]

Just relearned everything I did in a whole semester lol thank you

[MrSuperi]

I'm loving this series so much! Keep up the good work guys :D

[kyaribukar]

This is very interesting and thanks for ur contribution

[RedBlueLabs]

well done, good teaching resource for my class. keep up the good work

[tonynasaofficial]

These videos helped me 6 years ago when applying for maintenance at USPS I got a 100 score c: I still have my usps ID badge to this day ✨️

[NMrick]

Agreed...series is great and necessary before more advanced topics can be understood.

[tomv]

The part about inconsistencies in the manufacturing of resistors could have included a brief mention of tolerance (the last color band on a resistor, which denotes the tolerance of the resistance value). Other than that minor note, a great explanation.

[benlee]

Puzzle again. One another question, current is constant before and after resistor. A bit different from water. Able to really explain how electrons flow in the circuit and how it loses energy after passing thru the light bulb and still continue to flow?