Question

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

Where,

Voltage,V = 220 V

Current, I = 5 A

P = 220 × 5

P = 1100 W

Energy consumed by the motor = Pt

Where,

Time, t = 2 h

= 2 × 60 × 60

= 7200 s

∴ P = 1100 × 7200

= 7.92 × 10⁶ J

Therefore, power of the motor = 1100 W

Energy consumed by the motor = 7.92 × 10⁶ J