Resistivity

This video is about Resistivity, what happens when the cross sectional area of cable changes. What does type of conductor and length do to resistance. This can be applied to fault finding if you know the resistance, conductor type and CSA, then you can find the distance to the fault - just rearrange the formula.

Discover what Rho is and apply to all electrical principles exams great for all level 2 or 3 electrical qualifications.

[heathersimmons]

Thank you! A very clear explanation that will help my students a lot!

[sparkyhelp]

Infinitefury234 commented: (for some reason I cannot see the comment properly) the answer @7:46 was wrong, the answer is correct, you just need to put x10^9 not x10^1. Hope that helps.

[ferdinandwilhelm]

Thanks a lot for this tutorial. Everything makes perfect sense how you described it. However, I got lost with the result of your first calculation. Would you be able at all to let me know in the comments how you ended up with 1.153 as the result? It would've been great if the equation had been broken down into 2 or 3 more steps for clarification. I somehow ended up with 19.95. I wrote out the exponents to their decimal numbers to be able to understand the math path, but it didn't add up for me. Thanks a lot!

[helim]

Thank you very much, what a video explaining resistivity. Well done 👏

[joshuaking]

I don't understand how you got 1.5mmx10 to the power of minus 6. Do you do this for every calculation with this formula?

[MomentsWithBrandon]

hey sparky me again haha,

how would you go about finding the out the length of a cable needed when you have no resistivity.
The question Im trying to answer only gives me the CSA, The conducting material, the voltage it may not exceed which is 11.5 and a amp of 13. I know I have to transpose the resistivity formula giving me L=RA/P but I just dont know how to find out the resistivity in the equation.

Please help

[ryanmorris]

This 10 to the power of confuses me. Can anyone elaborate on this please?

[Issa]

How he got his role confuse me can somebody explain please

[YouTuber-mxxy]

According to my textbook you're rho figures are slightly wrong.
According to my textbook:
Copper: 17.5 X 10 ‐⁹
Aluminium: 28.5 X 10‐⁹

[markcollins]

Why does every single person who makes videos relating to electricity talk so quietly. Its impossible to follow. Theyre all whispering