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6 Cards in this Set
- Front
- Back
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On a building site a machine is used to lift a bag of sand from the ground to the top of a building.
What type of energy has the bag of sand gained?
A elastic potential energy
B gravitational potential energy
C kinetic energy D thermal energy |
Gravitational potential energy
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What type of energy is stored in a stretched rubber band?
A chemical energy
B elastic strain energy
C gravitational potential energy D kinetic energy |
Elastic strain energy
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Match words from the list with the numbers 1 to 4 in the sentences.
A kinetic energy .......... B light ................... C sound ................... D thermal energy .................... A motor makes the mobile go round. The motor transforms electrical energy mainly into ……1……. When the mobile is switched on it becomes warm after a short while. This is because some of the electrical energy is transformed into ……2…… Speakers in the mobile transform electrical energy into ……3…… There is a ‘power on’ indicator on the mobile that transforms electrical energy into ……4…… .
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1.) 1 – A, 2 – D, 3 – C, 4 – B
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An electric fan is used to move air around a room.
(a) The fan usefully transforms electrical energy into:
(b) Energy that is not usefully transformed by the fan is wasted as: |
A.) Kinetic Energy B.) Heat energy |
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The energy required to lift two skiers to the top of the mountain is 240 000 J. The energy supplied to the motor is 800 000 J. Calculate the efficiency of the motor.
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0.3/30%
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The diagram below is a Sankey diagram for a filament light bulb – How many Joules are wasted and what is the waste energy?
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1.) 90J Heat
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