Question

When a current of 4.0 A passes through a certain resistor for 10 minutes, 2.88 × 10⁴ J of heat are produced. Calculate

 the power of the resistor.
 the voltage across the resistor.

Answer 1

I = 4.0 A
H = 2.88 x 10⁴ J
t = 10 minutes = 10 x 60 = 600 s  

Power `=H/t=(2.88x10^4)/60=48W` 

V`=p/I=48/4=12V`