Resistivity and Resistance Formula, Conductivity, Temperature Coefficient, Physics Problems

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This physics video tutorial explains the concept of resistivity and resistance of electrical conductors like copper and silver as well as semiconductors such as silicon, germanium, and carbon graphite. It provides the formula to calculate the resistance of a metal or wire using resistivity. It discusses the inverse relationship between resistivity and conductivity as well the direct relationship between resistance and temperature. Electrical conductors such as metals have a positive temperature coefficient of resistivity which means that as the temperature of a metal increases, the resistivity will increase and the conductivity will decrease. For metalloids or semiconductors, the opposite is true. These elements have a negative temperature coefficient which means that the resistance will decrease as the temperature increases which correlates to an increase in conductivity. The resistivity depends on the length of the wire as well as the cross sectional area. Long wires have more resistance and short wires conduct electricity better. Thick wires have less resistance than thin wires. This video shows you how to calculate the temperature by simply measuring the current in a metal using a known voltage which has practical applications in digital thermometers.
Electric Current In Circuits:
• Electric Current & Cir...
The Electric Battery:
• The Electric Battery a...
Ohm's Law Problems:
• Ohm's Law Explained - ...
Resistor Color Code:
• Resistor Color Code Ch...
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Internal Resistance of a Battery:
• Internal Resistance of...
Electromotive Force of a Battery:
• Electromotive Force of...
Drift Velocity and Current Density:
• Drift Velocity, Curren...
Potential Difference Between Two Points:
• Potential Difference B...
Alternating Current Vs Direct Current:
• Alternating Current vs...
______________________________
Schematic Diagrams & Symbols:
• Schematic Diagrams & S...
Open, Closed, and Short Circuits:
• Open Circuits, Closed ...
Resistors In Series:
• Resistors In Series - ...
Resistors In Parallel:
• Resistors In Parallel ...
Physics PDF Worksheets:
www.video-tutor.net/physics-b...

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21 фев 2017

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Комментарии : 188

@TheOrganicChemistryTutor 6 месяцев назад

Final Exams and Video Playlists: www.video-tutor.net/

@NoName-ms8kk 2 месяца назад

Hello Sir! Can you recommend me some books where I could find some more practice problems about this? Thank you!

@kiddflxcko2439 Месяц назад

A university accepted me because of the help I got from watching your videos for them and physics... Man, you're a hero throughout my first semester too. I'm sending love and appreciation from South Africa🙏💙

@egeyalin98 6 лет назад

I suppose that you are the super hero of engineering students sir thanks a lot.

@shivxm3111 3 года назад

Bruh not just eng students learn through this channel😳

@krishgojiya5886 2 года назад

We are facing this in class 10🙄

@yunusemreaslan3016 2 года назад

harbı varya bu adam olmasa fizikten kalırdım

@ice-nw3ps 2 года назад

@@yunusemreaslan3016 ben yine de kaldm.d

@KimJongDeux Год назад

Mid term in a few hours lmao

@eggxecution 4 года назад

so glad to finally see you with 1 million subscribers! Keep it up bro. I'm 2nd year college with electronics engineering degree. i live in a third world country and I'm doing my best to study hard so that I can help my poor country. Keep helping people, ur doing a very good job.

@nuranna4100 4 года назад

goodluck :)

@jimhalpert9803 4 года назад

That's a very positive mindset. It's nice that you want to contribute to your country. Good luck!

@ozge8262 3 года назад

good luck!! i hope everythings going well

@lexander9686 3 года назад

good luck brother

@al8728 5 месяцев назад

hru

@grilledjalapena 4 года назад

Your videos have helped me 100% through my physics course. Thank you, it really clarifies the chapter text which can be a bit overkill at times, the concepts it explains. THANK YOU!

@dancingdino1418 7 месяцев назад

Are calculators allowed?

@clarachristensen3194 5 лет назад

You are the BEST. Only reason I got an A in Physics I. Thanks man!

@alle7540 Год назад

i only watched this guy for math tutorials but it turns out he has videos on literally everything

@BuddyB2001 3 года назад

Currently you are one of the only ways I am learning electrotech right now because our teacher does screw all, thank you.

@sanawaqas9918 3 года назад

Loving this guy even more as I watch him explaining

@jaycee_16 3 месяца назад

I'll be taking the Electrical Engineering board exam on April 24-25, 2024. You helped me a lot. Praying that I pass the exam. ❤❤❤

@susanmotsamai3678 2 месяца назад

How did it go

@drx5226 2 месяца назад

How did you do?

@gooshawn2899 2 месяца назад

You passed?

@ozge8262 3 года назад

thank you so much for these videos!! i always study by watching them they are so clarifying

@galactusisapuss Год назад

You are a god! My teacher couldn't even teach me this and I've been doing this in college for the last 4 weeks!

@Lone_Mohib 2 года назад

If such mentors are available in a country then this is definite that the country would never decline....

@ChituProtimBoruah 7 лет назад

Good Job ! this channel is just making an ausome progress ..

@idinkster5891 4 года назад

This video is so good! I just had a question... Are there standards for the temperature coefficient of materials? Could you theoretically work out the resistance of wires at a certain temperature without knowing the specific temperature coefficient?

@morrowzhang8960 4 года назад

thank you so much for posting this video. this is very helpful and useful and clear!!!

@nightprowess1244 7 лет назад

Thank you so much for this video, I was stuck on a problem involving the top equation at the 11 minute mark. I was given the resistances and one of the temperatures and I had to find the other T and I never would have been able to do it without you showing the bottom equation in the red box with R instead of rho. Thanks again!

@NallahJoyceBegai-fg4dr Год назад

This video is so helpful! It is clear and understandable in my difficultyies.

@xnine7158 2 года назад

helped me a lot since high school and still now in college thanks!

@pilotactor777 3 года назад

good job-havnt done physics in 30 years

@jadenoram8059 4 года назад

Learnt so much in such a small period of time thank you

@user-cr8rj5qx7k 4 года назад

I totally agree. Our teacher hardly teaches our class but this has helped me alot.

@nicolegaming812 3 года назад

i'm excited to use this to my day to day life yay!

@mfitimanaamani4027 Год назад

I'm scholar in agricultural mechanisation but I need you to upload all videos support in electrical engineering component in basic engineering module , however,. you exceptional tutor.thanks

@olwethunqobilenyathi8117 2 года назад

These videos are helpful 😩❤️❤️🔥Thank you very much sir

@alhassanmichael306 2 года назад

You are a wonderful teacher 👏👏

@keedbilly1872 Год назад

Thanks so much sir may God bless you 🙏💯 you're a super hero for engineering students salutations 💯✅

@dwendzzeldrian3160 4 года назад

Air conditioning units are mostly used during summer period. A simple electrical circuit may represent the set-up of the aircon: a rheostat connected in series with the whole cooling mechanism (represented by a single resistor) and these combination is then connected in series with the power switch. The whole circuit is supplied by a 220 V power supply. The following are the values of the components: rheostat (10 ohms to 10,000 ohms) and the cooling mechanism (100 ohms). By theory, the higher the power consumption of the cooling unit, the higher the current flowing in the cooling mechanism. Given the following scenarios, answer the following: b) Let us assume that the current value of the rheostat is 1000 ohms. Assuming that the value of the total current represents the current temperature (2 A for 18 degrees and 0.2 A for 25 degrees). Draw the electrical diagram and calculate the temperature at 1000 ohms.

@supergaming3286 Месяц назад

watching your videos from India Thanks for your help

@cornyanyanwu5084 Год назад

May God bless you so much sir , my brother who is now in his 3rd year in medicine recommended you to me , and I'm 14 years and im in my finals I'm about to enter University but it's a bit hard for me and because of God and your help I will pass , your videos help us a lot ❣️ you can't imagine how grateful I am

@anthonybelcher3817 Год назад

why are you going to entry university at 14? Enjoy your childhood, best years of your life

@ernestcanlas7962 2 года назад

Thank you so much! You're a lifesaver 😁😁😁😁

@NickTheHunter 6 лет назад

Nice video! Good explanation. Very concise, straight to the point as I like it :3

@aparajitabhaskar1775 6 лет назад

Nice video . Understood everything . Keep up the good work .

@alhamdulilah4950 2 года назад

May Allah give u more knowledge brother.

@kevinthomasjobi4986 4 года назад

It helped me a lot thank you

@mostafauddin3051 4 года назад

I'm so thankful to you.

@birukkifle8447 6 лет назад

In 30 sec answer many of my question. Thanks a lot!

@user-fy4rg1pu7i 3 года назад

You teach better than my old grandpa teacher

@malawomugwagwa2627 2 года назад

Awesome lesson 😌💯💯💯

@print4yourself 6 лет назад

You're amazing. Much better than my professor!

@NeverendingAbyss 5 лет назад

I love people like you. Always helping other people understand!

@ilya8132 8 месяцев назад

You are so cool, JG.

@azasgaming4933 2 года назад

Thanks for helping me for the electrical technology course finals, tomorrow is exam wish me well.

@Jaden-up3bg 4 года назад

Thanks dude! Woot woot

@PreciousKlaymbazima Месяц назад

We say thank you as MULUNGUSHI UNIVERSITY students, Zambia ❤

@kangmoabel 3 года назад

በጣም ምርጥ ነው from Ethiopia ❤❤❤

@Exoudar 4 года назад

Thank you so much! I have a question at 16:50 when you wanted to calculate voltage drop for a 300m copper wire length. Why did we divide V by 15 when we wanted to calculate voltage drop for 15 meters, but then multiply it by 300 when we wanted to calculate voltage drop for 300m? Shouldn't we take the original resistance at 20 C (1.783 mv) and divide it by 300m instead?

@jimhalpert9803 4 года назад

0.119 mV is voltage per meter so for 300meters will be 0.119 x 300

@thatmemestar378 11 месяцев назад

Teacher forgot by saying 'p' for resistivity throughout , it's actually greek 'rho' ( Greek R )

@abhaysharma331 3 года назад

Thanks a lot 🙏

@CubeWorldbyArchie 7 лет назад

Thanks a ton! Keep up your good work👍

@TheOrganicChemistryTutor 7 лет назад

No problem

@msfreya777 6 месяцев назад

Someone clear my confusion please. Isn't R0 supposed to be the resistance at 0 C?? So, aren't we su[pposed to do it the other way?The alpha s will cancel and then by putting the values we can get the answer. In my book, two different tempuratureds are given and one of the resistance in one of those two twmpuratures are given. We are asked to find tempurature coefficient. So, they didn't put the 25C (which is R1) in place of R0..cuz that's suppposed to be the resistance at 0C.

@xXxserenityxXx 5 лет назад

Excellent. Thank you for your efforts.

@barokyeshiber2474 Год назад

this was a very great video and i learnt a lot from you today, thanks .... But what's up with the siren from 14:00 to around 14:40

@vincentbanda4181 Год назад

Thanks that's fantastic

@samuelszocs2840 3 месяца назад

You are the best

@burgerlover57 3 года назад

Thank you so much

@romeerwinfestin2462 3 года назад

Given Rm = .74 @ 20 Celsius, what will Rm equal at BHT if Total Depth is 2400m and the Geothermal Gradient is 2 Celsius/100m (Surface temperature 20 Celsius) ?

@Waffle24INC 5 лет назад

This Guy kicks ass

@mohammedsami2709 2 года назад

Fucking goat bro, You teach hard things in such simple way that u can teach a 5th grade these and they will understand. Keep up the good work bro

@Rationality4Life 5 лет назад

Thanks for explaining so succinctly. Understood everything

@shaikha206 4 года назад

Thank you

@jimhalpert9803 4 года назад

I got temp as 34.7 . Is it close enough cause I don't want to use more than 2 decimal places (I can't use calculator in exams)

@shahriarabir4898 2 года назад

i fing love you , can you post some question to solve ? that would be great as a practice work . thanks in advance

@adrianvintila5077 3 года назад

At min 12.56 you calculate the area as pi(3*10^-3)^2 but we got told to do pi(3*10^-6) Which gives you a different result. I had this same thing repeated in university as well.

@Visual_Gag Год назад

You have to square everything in the brackets, so (3*10^-3)^2 becomes 9*10^-6 rather than (3*10^-6)

@emortaltt 6 месяцев назад

I have a question, I'm working through my Electrotechnics N4 model now and am busy with resistivity. I have the length of a wire which is 25 but in my example in the handbook, where R=PL/A, they still timed Lx2 to give a length of 50m which I don't understand why. Think you can help?

@islaakosua400 5 лет назад

Dude you're amazing....

@nayrbsworld3048 Год назад

bravo. could you please make video also for callendar van dusen constant?

@KylianMbappe07303 5 месяцев назад

1:11 2) the energy that is present in the electrons when travelling from source to end point is lost midway so not all electrons will pass through

@fisforfriendship6093 Год назад

use the water analogy. voltage is pressure current is water resistance is the valve or in this case wire. longer the pipe the more water is needed to get to the other side meaning higher resistance. smaller pipe will transfer even less current/water so higher resistance and vice versa

@alizachughtai9212 4 года назад

god bless you

@lickmytoesplease5798 6 лет назад

Hi, just a question to do with the difference between single-core cable and twin cable. If you have a Cross-Sectional-Radius (CSA) on a cable of 2.5mm and it is a twin cable, do you double the Cross-Sectional-Raduis (CSA) to 5mm as you are sending a set voltage( Let’s say 230v for me in the UK) down 2 cables, in which case you half the voltage as it’s going down 2 separate cables? Because this would then change the value of resistance at the end of the circuit. Cheers

@devika5432 5 лет назад

nice work👌👌👌keep doing...... Nice class 👌👌👌👍👍👍👍

@BryanArden 2 года назад

should have paid my college tuition to you🤣thanks a lot OCT

@wendy516 3 года назад

Thanks a lot

@saifulazhar4383 2 года назад

thank you i love you

@malikzain601 3 года назад

Find the resistance of an iron rod 2 cm in diameter and weighing 3 kg.?

@chirayubanappa3607 Год назад

im in need of a calculator for my exams, got any suggestions on what to buy, scientific or Graphical?

@andreyleynes3265 6 лет назад

Is it necessary to press the "ENG" button on the calculator in getting the final answer? For what I know the answer is still the same.

@hariharan-yi8tf 2 года назад

U r right 🙂

@subbu7512 3 года назад

I just love how he doesn't like any comment or heart it / pin . Just reading it nd being happy

@nikolay97x 6 лет назад

You are amazing!

@wiinguyen3683 Год назад

Thank you!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! GOD!!!!!!!!!!!!!!

@Marshalop722 4 года назад

Very nice explanation 👌👌but in very low voice 😔😔

@miles7374 Год назад

New superconductor just dropped, feeling curious

@Zahraamaan2005 7 месяцев назад

Thanks I’m studies Biomedical Engineering

@user-xd3ge7uf2r Год назад

Hello, I was hoping you could help me possibly. I was planning on maybe getting into some silver and gold purchases and learned of the rather large problem with fake metals being placed inside gold and silver products . However I also learned that there is a device called a sigma metalitics precious metals verifier the will test metals authenticity based on resistivity. Well knowing that the multimeter tool from the store costs like 40 bucks and measures resistivity ohms and all that stuff and that this gold tester costs over $2,500 dollars I was wondering,.... well I've been pondering that there must be a way using equations such as yours to verify a metal resistivity and thereby the metal itself since they all have a different resistivity .... such as taking a reading from the multimeter and then performing an equation on it that should always come out to that metals exact resistivity..... otherwise it would not be authentic gold or silver.... There has to be a way... that must be what they are doing with the expensive machine.... im sure you figured out by now I am wanting to use the resistivity test using the math equations and $40 tool rather then the $2500 dollar tool. What equations' for a coin and bar would I use.... always at room temp... to determine if the metal is authentic.... I am thinking that if I know the equations I should be able to use a multi meter and do the calculations myself with a calculator rather than paying 2500 dollars for something to do the calculations for me.. That's one high priced calculator. Please let me know and Much Thanks For Any Help You Can Provide to me!!!!!!

@dihydrogenmonoxide6748 Год назад

Is there a technique to memorizing resistivity of materials

@user-mw8hq5pg5f 8 месяцев назад

super

@abdleugaderlbrahim8617 6 лет назад

انت زيت الزيتون you are the oil of the oil ..! #thank you bro

@complcated9454 5 лет назад

nope you are the oil of the olive nigga

@yazen4386 4 года назад

Buma lika

@galalelotladi8668 6 лет назад

Thanks helped alot....

@nazrinsalimzade2598 4 года назад

Hi,can somebody help me with this problem?Intensity of the electric field in steel wire of cross-sectional diameter 0.8mm equals 20 mV/m. Find the current flowing in it if the resistivity of steel is 1.2·10^-7 Ω•m (pi=3)

@manojmaheshwari4055 4 года назад

Using ohm's law V=IR, U can find that I=V/R where V is given and to find resistance R use the formula R=P(resistivity given)L/A.But I can't help u how to find L.

@chopineh998 5 лет назад

You are the best 😍

@justinvr9812 2 года назад

I am trying to calculate alpha in my course, i am just missing the algebra steps and cant find it anywhere

@waqqarahad8762 4 года назад

Very nice explanation but very low voice recording

@alexandrelaframboise4639 5 лет назад

I always have trouble knowing if "A" in a formula is the area of a cross section, or the surface area.

@nisha2536 3 года назад

Instead of writing “a” or whatever the format of the equation is I write the formula out with words so I know for sure that it’s not gonna mix up.

@abamalarcon3526 3 года назад

How to know what will be the P's value?

@nayrbsworld3048 Год назад

could someone explain how 9:31 . how to compute it? i still dont understand

@abhishekbhawnani5901 6 лет назад

metal on heating expands. so, larger the wire more will be the resistance. that's why metal resistance increase with increase in temperature right? is this correct? can we use this reason? :/ help!