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Senior High School: 11th and 12th Grade
Physics
Electricity - Mains Electricity
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Q.1
What size of fuse would be required for an electrical appliance which has a power rating of 600W and running off UK mains voltage at 230V?
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1 A
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2.5 A
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3 A
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5 A
Q.2
Most appliances have their power consumption and potential difference printed on them. Which of the following can be calculated from these values?
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Internal resistance of transformer
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Momentum
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Current
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Work done
Q.3
Why do some appliances not need an earth wire?
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These appliances do not need an earth wire as they don't use electricity
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They are double insulated so that shocks cannot be caused if the appliance malfunctions
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They have been incorrectly wired
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All appliances need an earth wire, some do not have a neutral wire
Q.4
If an appliance uses mains electricity at 230 V and the service manual for the appliance recommends using a fuse of 13 A, what is the power consumption it can safely use?
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2020W
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2550W
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2990W
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3520W
Q.5
What is the main difference between a circuit breaker and a fuse?
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A circuit breaker can be used to control electrical circuits
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A circuit breaker can be reset whilst a fuse needs to be replaced
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A fuse can be reset whilst a circuit breaker needs to be replaced
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A fuse can be used to control electrical circuits
Q.6
Which color wire is the live wire in a 3-pin plug?
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Blue
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Yellow and green
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Brown
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Red
Q.7
Some cables for electrical appliances only have two wires within them. Which wire is missing from this configuration?
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Earth
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Neutral
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Live
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The red one
Q.8
What does the power of an electrical appliance represent?
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The amount of current that passes through the appliance
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The rate at which it transforms energy
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The speed at which it performs a task
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The size of voltage that the appliance uses
Q.9
What do electrical appliances transfer?
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Chemical energy
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Electrical energy
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Light energy
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Sound energy
Q.10
What kind of a plug is used to connect electrical appliances to a mains socket in the UK?
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2-pin plug
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3-pin plug
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4-pin plug
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5-pin plug
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