100 joules of heat is produced per second in a 4 ohm resistor. What is the potential difference across the resistor?
Here, it is given H = 100J, t = 1sec, R = 4ohms,
We know that according to Joule's law of heating
H = I2RT
100 = I2×4×1
100/4 = I2
I = 5amp
Again we know that
V = IR
V = 5X4
= 20V