Question

An electric heater of resistance 8 ohm draws 15 A from the service mains 2 hours . Calculate the heat which is developed​

Answer 1

Given that - R = 8 ohm

I = 15 A

T = 2 hrs = 2 x 60 x 60 = 7200 s

by the formula of heat energy we know that ,

H = I2 R T

H = I X I X R X T

H = 15 x 15 x 8 x 7200 = 12960000 J = 12960 KJ

hoped so u got the ans....