How do I solve the problem?

Question

The resistance of an electric heater is 55 Ω when connected to 120 V. How much energy does it use during 25 min of operation?

Answer 1

Given

R = 55 Ω

V = 120 V

current, I = V/R

= 120V/55Ω

= 2.18 A

Power, P = VI

= (120V) (2.18A)

= 261.6 W

Energy = power x time

= (261.6 W) (25 * 60 s)

= 392400J