physics question?

Question

Asmall radio operates on 5.00 V and has a resistance of 50.0 amps. At what rate does the radio use electric energy? ____ ____

Answer 1

50.0 amps is a current, not a resistance. The power in a circuit is equal to IV, where I is current and V is voltage, so you have P = IV = (50.0 A)(5.00 V) = 250 W.

Answer 2

volts x amps = watts, so the radio use 5 x 50 = 250 watts of electric power.

Watt is a unit of power, that means energy per unit of time.