Efficiency

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Physics

Efficiency

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10 Terms

1
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Efficiency
useful output energy transfer / total input energy transfer
2
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power output/ power input
efficiency = useful________ / total________.
3
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thermal energy store
wasted energy is usually transferred into the________.
4
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100% efficient
no device is________.
5
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electric heaters
the only devices that are 100% efficient are________.
6
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insulating them, lubricating them or making them more streamlined
you can improve the efficiency by________.
7
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transfer energy
useful devices are only useful because they________ from one store to another.
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more efficient
the less energy that is wasted, the________ the device is said to be.
9
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energy transfers
most________ involve some waste energy
10
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electrostatic energy store
electrical heaters are 100% efficient as all the energy in the ________ is transferred to 'useful' thermal energy store.