Question

An electrical bulb marked with 100 v , 60 w is used fo 5 h in a week.what is the cost of electrical it the rate is rs 3 per unit?

Answer 1

given power of bulb = 60 W

Operating time = 5 hour

Electrical cost per unit = Rs. 3

We know energy consumption of bulb = 60×5 = 300 W h = 0.3 kW h

Thus electricity bill for consumption of 0.3 unit = 0.3 × 3 = Rs. 0.9