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Flashcards in Energy and efficiency Deck (4)
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1

The law of conservation of energy states that...

...energy can neither be created nor destroyed, it can only be transferred.

2

True or false, 100% of energy is transferred into useful energy during an energy transfer.

False. Only part of the energy is usefully transferred, the rest is "wasted".

3

Wasted energy does what?

It is transferred to the surroundings, which become warmer. The wasted energy becomes increasingly spread out and less useful.

4

Calculating the efficiency of a device. Formula:

Efficiency = Useful energy out/Total energy in

Or

Efficiency = Useful power out/Total power in