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A good engine is an efficient one. An engine converts energy in one form to energy in another form.
How fast that happens is measured by the power. If a joule of energy is converted every second, that is a power of 1 watt.
If you measure the power of the energy put into the engine, and the power coming out, then divide one into the other, that is called the efficiency, usually a percentage. A perfect engine has 100% efficiency. All practical engines have less than 100% efficiency, so less comes out than went in. For that reason engines get warm or hot on the wasted energy.
Examples of efficiency:
Electric motor or generator 90-98%
Steam or gas turbine 20-50%
Diesel or petrol engine 20-25%
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