Frazer does Physics: 4.15 Power Formula

October 4, 2011

4.15 Power Formula

Use the relationship between power, work done (energy transferred) and time taken:

$Power=\frac{Work\: done}{Time}$

$Power=\frac{Wd}{t}\: or\: \frac{E}{t}$

P = Power (Watts, W)
Wd = Work Done (Joules, J)
E = Energy transferred (Joules, J)
t = Time (s)

Example

A girl does 1000 joules of work in 5 seconds. What power does she develop?

$Power=\frac{Wd}{t}$
$Power=\frac{1000J}{5s}$
$Power=200W$

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