Question

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

Answer 1

Given R = 4 Ω
H = 100 J
t = 1 s
We know that, H = I²Rt 

`rho=H/Rt=100/(4xx1)=25A^2` 

 I = 5 A 

Now:  V = I 

  V = 5 x 4 = 20 V