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Senior High School: 11th and 12th Grade
Physics
Energy - Transfers And Efficiency
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Q.1
A wind turbine generates 100 joules of electricity from a gust of wind which has 300 joules of energy. How efficient is the turbine?
0%
10%
0%
33%
0%
50%
0%
66%
Q.2
During an energy transfer, only part of it may be usefully transferred. What happens to the remainder of the unused energy?
0%
It's wasted
0%
All the energy is all transferred and used successfully
0%
It is converted into carbon
0%
It becomes a gas
Q.3
What happens to wasted energy?
0%
It decomposes into the ground
0%
It becomes hot
0%
No energy is ever wasted
0%
It is transferred into its surroundings
Q.4
What cannot be done to energy?
0%
Created or destroyed
0%
Dissipated
0%
Transferred
0%
Stored
Q.5
A solar panel is 20% efficient at converting light energy into electricity. If it generates 200 joules of electrical power, how much power is wasted?
0%
500 J
0%
750 J
0%
800 J
0%
1000 J
Q.6
What can be done to energy?
0%
It can be transferred
0%
It can be stored
0%
It can be dissipated
0%
All of the above
Q.7
Which formula can be used to calculate the percentage of energy transferred by a device?
0%
Energy Transferred = Useful Energy Output⁄Total Energy Input x 100
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Energy Transferred = Total Energy Input⁄Useful energy output x 100
0%
Energy Transferred = Useful Energy Output⁄Total Energy Input x 10
0%
Energy Transferred = Total Energy Input⁄Useful energy output x 10
Q.8
Calculate the efficiency of a heater which can convert 700 joules of chemical energy into 175 joules of heat energy.
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10%
0%
25%
0%
35%
0%
50%
Q.9
Which formula can be used to calculate the percentage of power transferred by a device?
0%
Power Transferred = Useful Power Output⁄Total Power Input x 100
0%
Power Transferred = Total Power Input⁄Useful Power Output x 100
0%
Power Transferred = Useful Power Output⁄Total Power Input x 10
0%
Power Transferred = Total Power Input⁄Useful Power Output x 10
Q.10
An LED converts around 80% of the energy supplied to it into light. How much energy is converted into light if a total of 50 J is supplied to it?
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30 J
0%
40 J
0%
50 J
0%
60 J
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