Question

A 12.0-V battery delivers a 0.75-A current to an electric motor connected across its terminals.
a. What power is delivered to the motor?
b. If the motor runs for 5.0 min, how much electrical
energy is delivered?

Answer 1

Answer

a. power is delivered to the motor

Is given by

$P=VI=12\times0.75=9$ Watts

b. If the motor runs for 5.0 min, then electrical

energy is delivered as

$P=\frac{E}{t}$

So energy is

$E=Pt=9\times60=540J$