Question

1. An electric motor consumes 4 units of electrical energy in two hours, at supply
voltage of 220 V.
(a) How many units does it consume in one hour? 2
(b) Give the power rating of this electric motor.
(c) Relate commercial unit of energy with its SI unit.
(d) Convert the total number of units consumed into SI unit of energy.
(e) Find the resistance of motor. [Based on CBSE Teachers' Manual]​

Answer 1

Answer:

a. 2unit

b. 2000W-220V

c. KWH=1000×60×60

=1000×3600

=3.6×10⁶

d. 4000

e. 24.2ohm