P1.2 Energy And Efficiency

killthemoment
Mind Map by killthemoment, updated more than 1 year ago
killthemoment
Created by killthemoment almost 6 years ago
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GCSE Physics (P1) Mind Map on P1.2 Energy And Efficiency, created by killthemoment on 08/09/2014.
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P1.2 Energy And Efficiency
1 P1.2.1 Energy Transfers And Efficiency
1.1 Appliances transfer energy but they rarely transfer all of the energy to the place we want. We need to know the efficiency of appliances so that we can choose between them, including how cost effective they are, and try to improve them.
1.1.1 Energy can be transferred usefully, stored, or dissipated, but cannot be created or destroyed.
1.1.1.1 When energy is transferred only part of it may be usefully transferred, the rest is 'wasted'.
1.1.1.1.1 Wasted energy is eventually transferred to the surroundings, which become warmer. The wasted energy becomes increasingly spread out and so becomes less useful.
1.1.1.1.1.1 To calculate the efficiency of a device use the following equations: efficiency=useful energy out/total energy in (x100%) or efficiency=useful power out/total power in (x100%).
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