100 Joules Of Heat Is Produced Per Second In 4 Ohm Resistor

100 joules of heat is produced per second in a 4 ohm resistor. What is the potential difference across the resistor?

Answers:

Given: H = 100J, t = 1sec, R = 4ohms,

We know that

H = I2RT

100 = IX 4 X 1

100/4 = I2

I = 5 amp

V = IR

V = 5 X 4

  = 20 V