Question

Question 2
An electric motor takes 5 A from a 220 V line. Determine the power of the motor and the energy consumed in 2 h.

Answer 1

Power (P) is given by the expression, P = VI
Given,
Voltage, V = 220 V
Current, I = 5 A
$P=220\times 5=1100W$
Energy consumed by the motor = P $\times$ t
Where, time, $t=2h=2\times 60\times 60=7200s$
$\therefore P=1100\times 7200=792\times {10}^{4}J=7.92\times {10}^{6}J$
Therefore, power of the motor = 1100 W
Energy consumed by the motor = $7.92\times {10}^{6}J$