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2 cards from this section. Quick, good the night before a test.
If a light bulb uses 60 watts and is on for 5 hours, how many kWh does it consume?
Use the formula: E_kWh = (P * t) / 1000.
A device consumes 1500 watts for 3 hours. What is the energy used in kWh?
Remember to convert watts to kilowatt with the formula.
What is the unit of electrical energy consumed?
Think of the unit used for electricity bills.
True or False: The total cost of electricity is calculated by dividing kWh used by the cost per kWh.
Remember the formula for cost calculation.
Calculate the total energy consumption of a washing machine rated at 500 watts operating 2 hours a day for 30 days. What would be the cost of this energy use if the rate is $0.14 per kWh?
Remember to multiply daily energy use by days in the month.
A 1200 watt electric oven is used for 1.5 hours a day. What will its monthly electric cost be if the cost per kWh is $0.18?
Calculate daily energy and then multiply by the cost.
6 more questions in this section. Enroll free to practise them all.
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