Alberta Grade 9 Science PAT Practice Test

How do you calculate kilowatt-hours from watts and hours?

kWh = Watts x Hours kWh = (Watts x Hours)/1000 kWh = (Watts/1000) x Hours kWh = Watts x (Hours/1000)

Correct Answer:

kWh = (Watts x Hours)/1000

Explanation:

Energy over time is found by multiplying power by how long it runs. Power in watts times time in hours gives energy in watt-hours. To express that energy in kilowatt-hours, you divide by 1000 because 1 kilowatt equals 1000 watts. So the clear way to write the conversion is kWh = (Watts × Hours) ÷ 1000. This shows exactly how to scale watt-hours into kilowatt-hours. For example, a 100 W device running for 2 hours uses 100 × 2 = 200 Wh, which is 0.2 kWh since 200 ÷ 1000 = 0.2.

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