See soorce fer Pouer (pheesics)

In [[pheesics]], '''pouer''' (seembol: ''P'') is the rate that [[mechanical wirk|wirk]] is duin or [[energy (pheesics)|energy]] is transmitted, or the amoont o energy needit or uised for a gien unit o time. As a rate o chynge o wirk duin or the energy o a subseestem, pouer is:
:<math>
P = \frac{W}{t}\,
</math> 

whaur ''P'' is pouer, ''W'' is [[mechanical wirk|wirk]] an ''t'' is [[time]].

The '''average pouer''' (aften juist cried "pouer" whan the context maks it clear) is the average amoont o wirk duin or energy transferred per unit time. The '''instantaneous pouer''' is than the limitin vailyie o the average pouer as the time interval Δ''t'' approaches zero.
:<math>
P = \lim_{\Delta t\rightarrow 0} \frac{\Delta W}{\Delta t} = \lim_{\Delta t\rightarrow 0} P_\mathrm{avg}\,
</math>

Whan the rate o energy transfer or wirk is constant, aw o this can be simplifee'd tae
:<math>
P = \frac{W}{t} = \frac{E}{t}
</math>,

whaur ''W'' an ''E'' are, respectively, the work duin or energy transferred in time ''t'' (for ordinar measured in seicont).

[[Category:Pheesics]]