Question

If a device uses 280 watts of power a day, about how many kilowatt-hours will it use in 30 days?
A. 6.700 kilowatt-hours
B. 200 kilowatt-hours
C. 8.4 kilowatt-hours
D. 6.7 kilowatt-hours

Answer 1

Answer:

B. 200 kW-hrs

Explanation:

Energy = power × time

E = (280 W) (30 days)

E = (0.280 kW) (720 hrs)

E ≈ 200 kW-hrs

Answer 2

B. 200 kilowatt-hours

What is energy in kilowatt hour(KW h)

A kilowatt hour (kWh) is a measure of how much energy you're using per hour, whilst a kW is a measure of power. kW stands for kilowatt, a universal standard for measuring electricity. So, one kilowatt equals 1,000 watts.

energy (KW h) = (Power (watt) * time (hour)) / 1000

given

Power = 280 watt

Time = 30 days = 30 * 24 = 720 hours

energy = (280 *  720) / 1000 = 201.6 kilowatt-hours ≈ 200 kilowatt-hours

correct answer will be B. 200 kilowatt-hours

learn more about energy in KW h

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