High School

An electric heater with a rating of 1000 W is used for 5 hours per day for 20 days. What is the electrical energy utilized?

A. 100 kWh
B. 200 kWh
C. 120 kWh
D. 500 kWh

Answer :

Final answer:

The electrical energy utilized can be calculated using the formula E = Pt, where E is the energy in kilowatt-hours (kWh), P is the power in kilowatts (kW), and t is the time in hours. In this case, the power is 1000 W, which is equal to 1 kW, and the time is 5 hours per day for 20 days. The correct answer is (a) 100 kWh.

Explanation:

The electrical energy utilized can be calculated using the formula E = Pt, where E is the energy in kilowatt-hours (kWh), P is the power in kilowatts (kW), and t is the time in hours. In this case, the power is 1000 W, which is equal to 1 kW, and the time is 5 hours per day for 20 days.

Calculating E = (1 kW)(5 h/day)(20 days) = 100 kWh. Therefore, the correct answer is (a) 100 kWh.

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