Practice - Energy Consumption in Kilowatt-Hours
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Practice Questions
Test your understanding with targeted questions
How many kWh does a 100 W light bulb use if it's on for 5 hours?
💡 Hint: Convert watts to kilowatts first.
If a laptop consumes 50 W and runs for 3 hours, how much energy does it use?
💡 Hint: Use the formula E = P * t.
4 more questions available
Interactive Quizzes
Quick quizzes to reinforce your learning
How much energy does a 500 W device use in 2 hours?
💡 Hint: Convert watts to kilowatts and multiply by hours.
True or False: A device using 1000 W for 2 hours will consume 2 kWh.
💡 Hint: Remember the conversion from W to kW.
1 more question available
Challenge Problems
Push your limits with advanced challenges
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.
💡 Hint: Calculate daily usage first, then multiply by 30.
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.
💡 Hint: First, find the rate per kWh based on the original bill.
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