Calculating Energy Efficiency - GCSE Physics | kayscience.com
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Calculating Energy Efficiency - GCSE Physics | kayscience.com
A device is useful because the device can transfer energy from one useful energy store to another useful energy store.
However no device is 100% efficient. This is because the device will transfer energy to non-useful energy stores.
The energy that isn’t transferred to a useful energy store is called wasted energy, or dissipated energy. The useless energy stores are usually thermal energy stores of the surroundings.
The higher the efficiency of a device the less energy is being transferred to the useless surrounding energy stores
The equation for the efficiency of an energy transfer in terms of power is:
efficiency = useful output power transfer ÷ total input power transfer
. .
Rearrange the equation for the useful output energy transfer in terms of power is:
useful output power transfer = efficiency x total input power transfer
Rearrange the equation for the total input energy transfer in terms of power is:
total input power transfer = efficiency x useful output power transfer
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