Resistance & Resistivity, Example Problems
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- Опубліковано 19 жов 2024
- Includes four different worked examples for calculating resistance and resistivity.
Resistivity is a property of a material that tells you how strongly it resists or conducts the flow of electric current. A low resistivity indicates a material that allows the flow of electric current. Resistivity is commonly represented by the Greek letter ρ (rho). The SI unit of electrical resistivity is the ohm-meter (Ω⋅m). Resistance of a conductor is directly proportional to the length of the conductor and inversely proportional to the cross-sectional area of the conductor.
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Show us the process of calculation too, don't skip it
Excellent! Busy on Sunday morning! Once again, the practical application is really helpful! Thanks again, great video!
You are ver welcome and thanks for commenting.
Thanks sooo much I finally understand it!! You're an amazing teacher!
You're welcome. I'm so glad to be helpful!
I don’t get it why do we have to use powers when converting mm to m for example y is 1mm squared when converted equal to 1x10 to the power -6
@@rohanwaseem3396 because the are 1000 mm in 1 m therefore there are 1000 x 1000 m2 in one m2. does that answer your question?
Thanks very much now am more than ready for the exam tomorrow ❤❤💪💪
Best of luck!
Perfect explanation ❤
Glad you think so, thanks so much!
Great video tutorial ❤ thank you for sharing your knowledge and experience 🇵🇭🫡
My pleasure, thanks for taking the time to comment 😊
Why there's no step by step computation for R, my calculator didn't get the answer
how to get resistance if i have a hollow copper tube length 5m and has external diameter10cm and its walls are thick 5mm the resistivity is 1.7×10power-8
Wow! Its very clear for me now. Thank you for this video.
Most welcome!
Thank you so much now I can solve
Hello, first I must praise ... a brilliant lecture. Can I have an explanation, please?
R = 2.65x10-8 x 10 / (pi) 3.14 (1.5x10-3) 2 = 3,75x10-2ohms
in my calculation it comes out:
R = 2.65x10-8 x 10/4.71x10-6 = 5.62x10-2ohms
Where am I making a mistake?
Thank You
Kind Regards
I'm thinking that you'll have to multiply the wire to the amount you get from L/A
you didnt square r
Am trying to Puch too but it's not giving me the same answer he is demonstrating
Good day sir. Pls, how can I measure or calculate the resistance per unit length of a constantan wire.
You can also refer me to any experiment you have done. Thank you.
On example number 3 did reciprocate to get that P=R•A/L like how did you get there?
I do not think I did the reciprocal, I rearranged the equation to solve for the resistitivity (p).
It's very helpful for me, thanks for uploading these amazing videos
It's my pleasure, thanks for the comments
Want more problems including circuit diagrams from this chapter....nice vid sir 😎
Here the link to another of my circuit videos. ua-cam.com/video/MUiHRqU4XBc/v-deo.html
Good Day Sir, Why the value of you copper resistivity is 1.68x10^-8? I thought its value was 1.72x10^-8 Ohm-m.
I just looked it up on Google and it says 1.72...I am not sure where I got the 1.68 from, but of course that is not really the point of the problem. Sorry for the confusion.
Dude ur explanation of the equation is legit but the problem comes when u place the final answers which does match up with what our calculators give
I mean doesn’t match ours
R = P×L÷A
What 'P' stand for in the formula please?
And where it's come from?
I studied few days ago but I didn't understand it, please help to explain me.
That is the greek letter rho which in this equation is the resistivity. It is explained in this video:
ua-cam.com/video/dRtNvUQC7c8/v-deo.html
@@stepbystepscience thank you so much.
in problem number 3 where did u get the 10 from
What 10 do you mean, the 10^-3? That is because the wire diameter is given in mm, which must be converted to meters before it is put into the equation.
A diameter of 3 mm is equal to 1.5 x 10^-3 meters. Does that help?
This comment was really helpful but how do I do the maths that"s kinda like my problem the indices stuff( how do we divide the raise to power minus stuff)😊😅
In my book, the resistivity of aluminum is 2.75x10^-8 ohms•m
Then go with what is in your book. That is probably what your teacher would want you to do.
@@stepbystepscience sometimes books are not correct, but more students confused what exactly to do in this situation.
Am trying Puch on my calculator but the figure you are giving out is not working
What is Puch?
Quick question
In my igcses will they provide me with the value of p (resistivity)
Yes they should.
@@stepbystepscience ok thank you
Thanks for the help man!
You are very welcome.
Thank you sir for well explanation
You are most welcome.
Step by step science
How did you get the resistance? How did you calculate it?
thanks man it really helped
Glad to hear it, you're very welcome.
L=pied2R/4p, to find length?
My motorcycle pick up coil has a resistance of 83 Omhs and a wire gauge size is 40 AWG . What will be the lenght of a wire? Please help.
40AWG is 0.00012 meters
you can use the formula to solve for length
Thank you again.
I don't get it 😢
How do u get resistivity?
I am not sure what your exact question is? I show you in the video how to calculate resistivity and resistance. Or if you want to know the resitivitiy of a material you can look it up in a book/Internet. Each material has its own resistivity. Does that help?
Please how did you get the answer
I do not understand, I showed you how to get the answer in the video.
Its useful
Thanks !
You're welcome!
Thank you very much 👍👍
You are very welcome
Thanx sir. I like it.✔️✔️
Thanks for liking it and commenting!
Can you please upload more problems on complexed circuits? I follow you sir you explain very well !
I have a whole playlist with a lot of circuit videos, here is the link to the first in the list
ua-cam.com/video/MUiHRqU4XBc/v-deo.html
Thanks for watching and commenting
Thank you sir 😀
How do you put the resistance into your calculator? I dont understand the 10 -8 part
That is a ‘to the power’ button which is usually an X with a square to the right of it
@@stupot4278 thank you i got that figured out but for the answer im getting 1.1 and 10-5
Wow great
Thanks!
I thought resistance = rho x length / area?
Is that not what I said?
I have a question.. How do we calculate the maximum current that pass through a conductor without destroying it?
Yes I also wanna know this... Any please
Eey that's awesome
Thanks so much!
Thanks
Welcome!
How it becomes 105m?
God will give you.
Thank you.
Calculate the resistance of 915 meters length of a wire having a uniform cross-sectional area of 0.77 cm² if the wire is made of copper having a resistivity of 1.7 × 10^¯6 ohm cm.
Can you pls help me in solving this
Thank you so much
You're most welcome
@@stepbystepscience ☺️
Thank u brother
You are very welcome
just wanna ask for the length problem. if its on mm is the -3 constant ?
Yes
Books name plz
What book?
thanks man
Any time!
thank you sir :D
Most welcome!
i love myself☺
Im not sure why im getting 10 to -5 for my answer, i divided 1.5 by 1000 to get. 0015
It becomes superconductor
Sir last one answer r square pls check it sir
What is this nonsense
In case you could not figure it out, it is a video about Resistance and Resistivity.
Even after u said nonsense how he replied calmly who s nonsense now