Ohm S Law

The power

P

dissipated in a resistor is given by the formula:

P%20%3D%20%5Cfrac%7BV%5E2%7D%7BR%7D

Where: -

P%20%3D%20100%20%5C%2C%20%5Ctext%7BJ%2Fs%7D%20%3D%20100%20%5C%2C%20%5Ctext%7BW%7D

(power) -

R%20%3D%204%20%5C%2C%20%5COmega

(resistance) Now, substitute the values into the formula:

100%20%3D%20%5Cfrac%7BV%5E2%7D%7B4%7D

Solving for

V%5E2

V%5E2%20%3D%20100%20%5Ctimes%204%20%3D%20400

V%20%3D%20%5Csqrt%7B400%7D%20%3D%2020%20%5C%2C%20%5Ctext%7BV%7D

Thus, the potential difference across the resistor is 100 V.

Chapter Questions
1 MCQs