Question

An electric heater is rated at 2 kW. Electrical energy costs Rs 4 per kWh. What is the cost of using the heater for 3 hours?
(a) Rs 12
(b) Rs 24
(c) Rs 36
(d) Rs 48; An electric heater is rated at 2 kW. Electrical energy costs Rs 4 per kWh. What is the cost of using the heater for 3 hours?
(a) Rs 12
(b) Rs 24
(c) Rs 36
(d) Rs 48

Answer 1

Answer:

The correct answer is option b)Rs 24

Explanation:

1. Given:
Energy used by electric heater=2kW

Cost of 1kW=Rs 4

Duration heater is used for=3h

Solution:

The total power used by the heater=2*3=6kW

Therefore, the cost for 6kW=6*4=Rs 24

The cost of using the heater for 3 hours will be Rs 24.

Thus, the correct answer is option b)Rs 24

2. The question is repeated.