Efficiency is the percentage of useful work in terms of total work completed.
Efficiency(%) = useful energy output(J) / total energy output(J) * 100%
1st Law: Energy is not created or lost but is only converted from one form to another. The amount of energy is always the same as it is never created or destroyed.
2nd Law: In energy transfer energy speads out and thus becomes less useful to us.
Enegy is also less useful if it is converted to an energy type we don't need.
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