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Senior High School: 11th and 12th Grade
Physics
Electricity - Transferring Electrical Energy
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Q.1
What is the useful form of energy produced by a kettle?
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Sound
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Heat
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Microwaves
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Light
Q.2
What is the useful form of energy produced by a radio-controlled car?
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Kinetic energy
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Radio
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Sound
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Heat
Q.3
Which equation can be used to calculate the amount of energy transferred from a mains supply?
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E = P x t
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E = t⁄P
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E = P⁄t
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P = E x t
Q.4
If a kettle uses 3 kW of power when it is switched on and is on for 2 minutes, how much energy is transferred during the period?
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0.1 kWh
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0.2 kWh
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0.5 kWh
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1 kWh
Q.5
An electric cooker heating element converts electricity to heat, but what else is also produced in this process?
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Sound
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Light
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Kinetic energy
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Radio waves
Q.6
What is the power of an appliance that uses 5 kWh in 15 minutes?
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20kW
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10kW
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5kW
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1.25kW
Q.7
If 1 kWh of energy costs 15 pence and an appliance with a power rating of 10 kW is switched on for 20 minutes, how much will the appliance cost to run for this amount of time?
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25p
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35p
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50p
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75p
Q.8
On what does the amount of energy an appliance transfers rely?
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Time, current and voltage
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Power and resistance
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Time, voltage and power
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Resistance and power
Q.9
Two appliances are switched on at the same time; one appliance uses twice as much power as the other but is on for half the amount of time. Which appliance uses more energy?
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The appliance which is switched on for the longer period of time
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The appliance which is switched on for the shorter period of time
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They use the same amount of power
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It's impossible to tell
Q.10
An iron, a kettle and a computer all produce what type of energy?
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Elastic potential
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Radio waves
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Kinetic energy
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Heat
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