Question

calculate the amount of electrical energy consumption for a month of 30 days in house hold of 220 v line with following appliances being used (a) five 60 w bulb for six hours ( b) two 1000w heater for two hours

Answer 1

(a).
We have,

electric power of 5 bulbs = 60 W × 5 = 300 W
time = 6 hours
electrical power used in 30 days = 300 × 6 × 30
= 1800 × 30
= 54000 Wh
= 54 kWh

(b).
electric power of two heaters = 1000 × 2 W
= 2000 W

time = 2 hours
electrical power used in 30 days = 2000 × 2 × 30
= 4000 × 30
= 120000 Wh
= 120 kWh