Question

Calculate the electricity units for a month of 31 days, if the following devices are used as specified :
(a) 3 bulbs of 40 W for 6 hours.
(b) 4 tube lights of 50 W for 8 hours

Answer 1

Explanation:

w = Watt × hours × days / 1000

w = ( 3× 40 ) × 6 × 31 / 1000

w = 120 × 6 × 31 / 1000

w = 22320 / 1000

w = 2232 / 100

w = 22.32 kwhAnswer

( b )

w = 4× 50 × 8 / 1000

w = 1600 / 1000

w = 1.6kwh Answer