Question

100W light bulb is used for 8 hr. Every day. What is the cost of its operation for one month at fixed rate of 30 cents per KWh?

Answer 1

Explanation:

Bulb Rating = 40 W = .04 kW

Bulb illuminates for = 10hrs/day

Bulb consumes units( kWH)/day= .04×10= .4 kWH/ day = .4 units/ day

In 30 days = .4×30 = 12 units

1 unit cost = 250/-

12 units cost = 250×12 = 3000/-