Resistors and Ohm's Law Video Lessons

Video Thumbnail

Concept

Problem: A copper transmission cable 100 km long and 10.0 cm in diameter carries a current of 125 A. (a) What is the potential drop across the cable? (b) How much electrical energy is dissipated as thermal energy every hour?

FREE Expert Solution

In this problem, we're looking for the potential drop, V across the cable given by Ohm's law:

V=iR

and electrical energy, E dissipated as thermal energy per hour given by:

E=P×T, where P is the power and T is the time in seconds.

80% (294 ratings)
View Complete Written Solution
Problem Details

A copper transmission cable 100 km long and 10.0 cm in diameter carries a current of 125 A. 

(a) What is the potential drop across the cable? 

(b) How much electrical energy is dissipated as thermal energy every hour?

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Resistors and Ohm's Law concept. You can view video lessons to learn Resistors and Ohm's Law. Or if you need more Resistors and Ohm's Law practice, you can also practice Resistors and Ohm's Law practice problems.