Question

Hi friends i have doubt in a question given below.... Could u all help me?

Calculate the electricity bill amount for a month of 31 days if the following devices are used as specified.
a. 3 bulbs of 40W for 6h
b. 5 tube lights of 50W for 8h
c. A refrigirator of 300W for 24h.

Given the rate of electricity is Rs 15.00 per unit..

Answer 1

You can use formula P=VIT

Answer 2

1 unit = 1 kwh

total kwh = 120W × 6h × 31days
= 22320
total consumed unit = 22320/ 1000 =22.32
22.32× 15 = 334.8

i think it's right