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 = I2 X 4 X 1
100/4 = I2
I = 5 amp
V = IR
V = 5 X 4
= 20 V