Electric Potential, Current, and Resistance

Whenever you plug something into an electrical socket, don't you wonder what's going on? Well you should, as it's pretty neat. What is electricity made of? How did we figure out how to harness this power? Let's take a look at electric potential, current, and resistance.

Check out "Is This Wi-Fi Organic?", my book on disarming pseudoscience!

[brankelly]

Just want to put in a thankful comment, because of your analogies to gravitational fields. The position of a particle in an electric field compared to the position of an object in a gravitational field was the clearest thing i've heard in a while!

[hszaidi]

Damn! Physics needs to be Daved!!!
You are awesome!

[pebre]

Mind blown when you explained potential energy from electric field analogous to the gravity field. Now i picture electrons falling from negative terminal to a positive terminal and force being applied to charge the battery like aaplying force to lift something up against gravity!

[VNCCentral]

I have always liked Pro. Dave’s explanation so far, everything of his videos is perfect, the illustrating pictures, the written and verbal explanations are very easy to understand, his voice is clear, the examples are interesting and fun. I admire you. Best wishes to you.

[erickcruz]

YOU ARE AMAZING. THIS VIDEO SINGLE HANDEDLY ANSWERED THOUSANDS OF QUESTIONS IVE HAD. THANK YOU SO SO MUCH. YOU HAVE NO IDEA THE AMOUNT OF CONCEPTS I CONNECTED RIGHT NOW! THANK YOU DAVE, YOU ARE AN AMAZING

[catvalentine]

This is mind blowing, thank you!! Also - we need an engineering series! There's a lack of good, english explanations in that area on yt!! :)

[charleshudson]

Nice video. Nice juxtaposition of gravitational Potential Energy (PE = mass X g X height), and electric Potential Energy (PE = -charge X E X displacement).

[nestoons]

"He knows a lot about the science stuff, Professor Dave Explains!"
the greatest sound in existence

[iyanulapite]

Thank you so much😭😭. We have a test tomorrow and this really helped. God bless

[francesaudreibolatin]

Hi Prof. Dave! Thanks for every single video, you helped me a lot and I really look forward on the engineering course. Please do an engineering approach in thermodynamics T.T Appreciate you so muchh!!

[mdabs]

That's Awesome Thank You Proffessor Dave

[valentingallier]

Can't wait more for an engineering course o_o

[grayeskye]

The way school taught me electric currents made me believe that current IS potential diff/resistance and potential difference IS the product of resistance and current
It took me 2 years later (now) to realise those were just formulas derived from the relationships I and V had in order to describe resistance - and that in fact, both I and V are completely different things on their own

Gotta love the school system and its abilities to confuse and misguide learners!

[trendingeditz-status]

"Resistance is the ability of a material to opoose charge flow"
This means the magnitude of charge not charge particles. Okay!

Reason: you can take an example.
There is a circuit with a 4V battery and 1ohm resistance wire. The current that flows through it is 4amp.
What if we double the area of cross section? We can treat it as two separate resistors of 1ohm resistance added parallel therefore giving rise to 1/2 ohm resistance in series.
You may notice that in this case motion of any charge particle is not affected. Means their velocity is still the same. But the amount is changed.

[antiquarian]

wish you could do more in depth problems regarding electric potential. great work anyways !

[isk]

I'm 29 yo guy who is willing to study engineering back to square one at this age. I haven't learn any physics in my high school and university. Thank you! Now everything is getting much clear for me, you are my hero!

[kethavathhemanth]

I am studied 11th and 12th class...But I didn't practically know what is voltage...
Professor dave ur really my hero ever teached like
May god bless you....

[guilhermesviech]

OH MY GOD THANK YOU IVE FINALLY UNDERSTOOD

[verygoodyogawithbilly]

Super helpful as always. Thank you Professor Dave!!

[mihir]

principle that the electric current passing through a conductor is directly proportional to the potential difference across it, provided that the temperature remains constant.
Sir in this definition last sentence is provided that the temperature remains constant . So if temperature is not constant how will it effect the circuit ?