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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 does not normally rely on electricity?
2. What is an advantage of using a kettle instead of a pan on a gas cooker to boil water?
3. Which would be safest and most efficient for toasting bread?
4. Which of the following items use electricity in the home?
5. What is an advantage of using a kettle instead of a pan on a gas cooker to boil water?
6. Which of the following items use electricity in the home?
7. How much power does a kettle use if it transfers 1,000 joules of energy in 10 seconds?
8. 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?
9. Another kettle has a power rating of 3 kW of power and transfers 2 kW of that into heat energy to boil water. How efficient is the kettle?
10. Which appliance would work if the electricity was not working in a house?

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