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Senior High School: 11th and 12th Grade
Physics
Electricity - The Usefulness Of Electrical Appliances
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Q.1
What is a disadvantage of an oven?
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Large capacity means it is not efficient for cooking small items
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Can only heat at one temperature
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Large capacity for cooking multiple items
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Has a timer
Q.2
Which of the following items use electricity in the home?
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Book
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Chair
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Step ladder
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TV and computer
Q.3
Which does not normally rely on electricity?
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Water tap
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Wireless router
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Tumble dryer
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Oven
Q.4
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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Kettle
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Toaster
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They use the same amount of power
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More information is needed to discover which appliance uses the most power
Q.5
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?
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33%
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50%
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66%
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75%
Q.6
What is an advantage of using a kettle instead of a pan on a gas cooker to boil water?
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Easier to pour the hot water
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Faster to boil water
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There is no advantage
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More efficient and often faster to boil water
Q.7
Which would be safest and most efficient for toasting bread?
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Cooker stovetop
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Toaster
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Oven
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Barbecue
Q.8
Which appliance would work if the electricity was not working in a house?
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Wind-up torch
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Solar hot water heater
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Gasoline lawn mower
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All of the above
Q.9
How much power does a kettle use if it transfers 1,000 joules of energy in 10 seconds?
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1 W
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10 W
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100 W
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1,000 W
Q.10
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?
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Kettle
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Hob
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They use the same amount of energy
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It is impossible to work out
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