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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
How many kWh does a 100 W light bulb use if it's on for 5 hours?
💡 Hint: Convert watts to kilowatts first.
Question 2
Easy
If a laptop consumes 50 W and runs for 3 hours, how much energy does it use?
💡 Hint: Use the formula E = P * t.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
How much energy does a 500 W device use in 2 hours?
- 1 kWh
- 1.5 kWh
- 2 kWh
💡 Hint: Convert watts to kilowatts and multiply by hours.
Question 2
True or False: A device using 1000 W for 2 hours will consume 2 kWh.
- True
- False
💡 Hint: Remember the conversion from W to kW.
Solve 1 more question and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
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.
Question 2
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.
Challenge and get performance evaluation