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Flashcards in Energy and efficiency Deck (4)
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The law of conservation of energy states that... can neither be created nor destroyed, it can only be transferred.


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".


Wasted energy does what?

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


Calculating the efficiency of a device. Formula:

Efficiency = Useful energy out/Total energy in


Efficiency = Useful power out/Total power in