Question

43. 100 J of heat is produced each second in a 422 resistor. The potential difference across the
resistor will be:
(a) 30 V
(b) 10 V
(c) 20 V
(d) 25 V​

Answer 1

Explanation:

it is 4 ohm not 422.

H = v^2/R *t

100 = v^2/4*1

v^2 = 100*4 = 400

v = √400 = 20