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1. Mechanical Power
The rate of energy transfer is sometimes more useful to consider than the total energy transferred. Not only is P = E/t but it can also be written as P = Fv.
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2. Efficiency
Although we often assume 100% of the energy is transferred from one form to another this is not always the case. When energy is lost from the system (perhaps as thermal energy) then its efficiency decreases.
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3. Power
This is how we define power, as well as a couple of simple examples using the formula P=W/t.
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