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Grades 11 and 12 - Physics - Senior High School - Electricity: The Usefulness of Electrical Appliances
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Grades 11 and 12 - Physics - Senior High School - Electricity: The Usefulness of Electrical Appliances
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10 Questions

1. Which would be safest and most efficient for toasting bread?
2. Which of the following items use electricity in the home?
3. Which does not normally rely on electricity?
4. If an electric stovetop uses 75 W of power in 300 seconds to boil water in a pan, whilst a kettle uses 100 W to boil the same mass of water in 150 seconds, which is the more energy efficient appliance to use for this process?
5. What is an advantage of using a kettle instead of a pan on a gas cooker to boil water?
6. What is a disadvantage of an oven?
7. If a 3 kW kettle is switched on for 3 minutes, when compared to a 2 kW toaster switched on for 5 minutes, which uses more energy?
8. Which does not normally rely on electricity?
9. How much power does a kettle use if it transfers 1,000 joules of energy in 10 seconds?
10. If a 3 kW kettle is switched on for 3 minutes, when compared to a 2 kW toaster switched on for 5 minutes, which uses more energy?

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