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phys: add second power equation
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@ -475,6 +475,9 @@ The types of energy involved may have varying values as long as their sum is fix
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Power is a a scalar unit represented in **watts** ($\text{1 W}=\frac{\text{1 J}}{\text{1 s}}$), and it is **not energy**, but instead the work done over a time interval, or the rate of doing work.
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Power is a a scalar unit represented in **watts** ($\text{1 W}=\frac{\text{1 J}}{\text{1 s}}$), and it is **not energy**, but instead the work done over a time interval, or the rate of doing work.
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$$P=\frac{\Delta E}{\Delta t}$$
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$$P=\frac{\Delta E}{\Delta t}$$
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Also:
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$$P=\vec{F}v$$
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### Efficiency
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### Efficiency
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Efficiency measures how much work, energy, or power is retained in a process, and is represented as a percentage ($1$ being 100% efficient, $0$ being 0% efficient).
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Efficiency measures how much work, energy, or power is retained in a process, and is represented as a percentage ($1$ being 100% efficient, $0$ being 0% efficient).
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