Question

100 joules of heat is produced per second in a 4 ohm resistor what what is the potential difference across the resistance1

Answer 1

H= 100 J
T= 1 s
R= 4 Ohm
H= I$x^{2}$RT
I$x^{2}$= 100/4*1
I$x^{2}$= 25
I= $\sqrt{x}$25=5
R= V/I
V= 5*4
V=20 V