Practice Energy Consumption In Kilowatt-hours (4.4.2)

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9 questions

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6 sample questions

Question 1.
How many kWh does a 100 W light bulb use if it's on for 5 hours?
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Convert watts to kilowatts first.
Question 2.
If a laptop consumes 50 W and runs for 3 hours, how much energy does it use?
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Use the formula E = P * t.
3Question 3.
How much energy does a 500 W device use in 2 hours?
- 1 kWh
- 1.5 kWh
- 2 kWh
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Convert watts to kilowatts and multiply by hours.
4Question 4.
True or False: A device using 1000 W for 2 hours will consume 2 kWh.
- True
- False
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Remember the conversion from W to kW.
Question 5.
You have three appliances: a 200 W lamp, a 600 W heater, and a 1500 W cooker. The lamp runs for 5 hours, the heater for 10 hours, and the cooker for 2 hours daily. Calculate the total energy consumed in a month in kWh.
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Calculate daily usage first, then multiply by 30.
Question 6.
If the monthly electricity bill for 250 kWh is $50, what would it be for a usage of 350 kWh? Calculate the cost using the per kWh rate.
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First, find the rate per kWh based on the original bill.

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