Question

A resistor converts 415 J of electrical energy to heat in 20 minutes.  Calculate the power dissipated in the resistor.  

Answer 1

Given

Electrical energy is $W=415 J$

Time $t=20 min =120 seconds$

The power dissipated in the resistor is

$P=\frac{W}{t}=\frac{415 J}{120 s}= 3.458 W$