Drift Velocity, Current Density, Number of Free Electrons Per Cubic Meter Physics Problems

This physics video tutorial explains how to calculate the drift velocity of an electron in a conductor as well as the current density. The drift velocity depends on the electric current flowing through the metal, the cross sectional area of the conductor, the number of free electrons per cubic meter in the metal and the charge per electron. The current density is equal to the electric current divided by the cross sectional area. This video explains how to calculate the number of free electrons per cubic meter given the density of the metal and how to calculate the density of the metal given the number of free electrons per cubic meter. This tutorial contains plenty of examples and practice problems.
Electric Current In Circuits:
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Alternating Current Vs Direct Current:
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[@TheOrganicChemistryTutor]

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[@ayo94563]

Story time. I just wrote my physics CA test (A level) and the first question was to find the drift velocity, I was one of the very few people that knew the formula but I made a stupid mistake and my final answer was wrong. Moral Lesson - Always watch tutorials videos to the end!!! Anyways... Thank you for this video.

[@TheKIngKiller21]

For example #5, shouldn't you have used 2.5 mm for the radius instead of the 5 mm value for the diameter of the wire?

[@alluseplatform6324]

Yeah he made a tiny mistake

[@mosesdanielshihepo63]

I agreed with you

[@MrBoholanongRealtor]

Yes . I notice . But it just an error .💕

[@josephr7753]

I noticed that as well

[@stephencastillo]

Literally the hardest topic right now , im not even one month into AS level

[@bfex1443]

Same man 💀

[@demonrhythms8761]

Huh, your questions are the best for any topic thanks brother. It's much worthier to watch your vids than doing huge chunky class tute

[@nax1807]

I honestly watch these videos and they make me motivated to study thank you so much

[@salemezeaku3722]

You're the best♥️.... keep up the good work

[@monicajensen9615]

this is so helpful!! also love blasting this video with AirPods in when an add starts out of nowhere at full volume :p

[@gojosatoru7jjk]

Perfect teaching ❤❤

[@tanjo4]

BEST VIDEO for this topic!! ❤️❤️

[@ImranSarwar-mn3uk]

This is the question .. which are in majority present in our entry test examination ... And hats Upp sir

[@immunealtair2737]

Nice and very helpful video, thank you very much However, I want to point out that in the last exercise, you took the diameter as the radius.

[@MohamedGamal-rv3cm]

Can you explain the concept first before solving the problems

[@henrymusonda2734]

Question (5) The 5mm was the diameter So we needed to divide it by half to get the radius with would be 2.5mm converting to metres we get 2.5*10^-03m The two find the area A=πr^2 =π(2.5*10^-03)^2 A=6.25*10^-6 m squared The final answer n gave me a magnitude of n=1.75*10^29 e/m^e It was just a slight mistake Thank you

[@ngyoklee8961]

17:40. Determine number of free electron per m cube

[@idowuburhan9054]

In the fifth question you used diameter instead of radius, but thank you very much 😁

[@mosesnjuguna3244]

what about this question ?A current conductor of 2.0mm diameter has a conductivity of 8.0*10^7 Siemen/m and electron mobility of 3.0*10^-3 m^2v^-1s^-1.It is exposed to an electric field of 20vm^-1.Calculate the Current density and Electron drift velocity

[@sudesahin8294]

Thanks for this informative video

[@aparnaperabattula2768]

wow plzzzzzz more imp physics problem for neet exams .sir😍😍

[@JEEandNEETNotesandTricks]

Aparna Perabattula kzbin.info/www/bejne/h3mZf52tobiYmZI Physics Video

[@aparnaperabattula2768]

JEE and NEET notes and tricks tq soo much sir😍

[@AmirX-qi6nk]

example#2, for (question C calculate current density) you didn't make square when you divide 2 by 0.05mm/s

[@afnanafnan9855]

Thank you sooooo much

[@waqasrehman9008]

Please let us know that how we can calculate current capacity of cable if we have size of cable in Sqmm?

[@TIGREinVOLO]

Hi and thank you for your videos. Any chance you could explain the concept of Drift Velocity for AC current? Am I right to say that velocity is zero since electrons move back and forth of the same distance? Thank you

[@denischarette-de3te]

While they move back and forth, they have a drift velocity that varies from 0 to MAX to 0 in one way and back to MAX to 0 the other way. The drift velocity and therefore the current varies sinusoidally with a frequency of 60HZ.

[@loyjensardnemla6995]

how to get the area ??

[@naturematters08]

veru helpful

[@narendergodara1992]

super👌👌

[@ghostfromcod7752]

nice

[@Callmeromain2016]

Why don’t you count the mass of the protons get the density at the end?

[@blastyt7180]

How did it become 10^-6 pls tell me

[@natnaelwondu8194]

What is your teaching tool i mean your electronic board is it a pc software ? plz

[@UltraTheBeastt]

yup you connect it to a laptop just a small board

[@techgirls3794]

anyone knows how he converts the density to a mole or whatever, I just can't get it no matter how much I repeated it he just does it like a piece of cake

[@Chintu9712]

I am not understand

[@stephencastillo]

same

[@louasgabeson8837]

D E J A V U

[@-tinshuetye-tsige3252]

+ Thank You!

[@joshuakayombo1762]

Lesa amipale bigeh🙏

[@Shiro-ws1zg]

why is it that you don't multiple the charge Q by 47, silver has 47 electrons and the question asks for free electrons ?

[@wasafitvonline9248]

Rocky B stop claiming only a single electron is involved in electric conductivity

[@ggodwin5312]

It's only the electron in the outermost energy level that is free to conduct electricity

[@okoyebethel1200]

11:51 1 divides 100 gives 0.001

[@neat677]

Ye why

[@okoyebethel1200]

@@neat677 he was wrong

[@mustafahajhamoud2077]

it's 9 months late , but he did not divide by 100, he divided by 100^2 which is 10000

[@dream.5708]

@@mustafahajhamoud2077 hey ik am late but can you please tell how he got 10 power -6 in the first problem

[@evanrutherfordlazyahole9079]

I hope this is difficult because it is for me.