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3 cards from this section. Quick, good the night before a test.
Calculate the energy consumed by a 100 W light bulb used for 2 hours.
Convert hours to seconds.
How many joules are in one kilowatt-hour?
Remember the conversion factor.
What is the formula for calculating electrical energy?
Think about how power and time relate to energy usage.
Is the joule the SI unit of energy?
Recall your lessons on SI units.
A home appliance uses 400 W for 5 hours. Calculate the total energy consumed in kilowatt-hours and joules.
Don't forget to convert watts to kilowatts.
If a device uses 1500 W and operates for 8 hours daily, what is the monthly energy consumption in kWh?
Consider the total days in a month and the daily usage.
4 more questions in this section. Enroll free to practise them all.
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