Definition:Power (Physics)

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This page is about Power in the context of Physics. For other uses, see Power.

Definition

Power the amount of energy transferred or converted per unit time.

Power is a scalar quantity.


Symbol

The usual symbol used to denote power is $P$.


Dimension

The dimension of measurement of power is $\mathsf {M L}^2 \mathsf T^{-3}$.

This derives from its definition as:

$\dfrac {\text{Energy} } {\text {Time} }$


Unit

The unit of measurement of power is the watt $\mathrm W$:

$1 \ \mathrm W = 1 \ \mathrm J \ \mathrm s^{-1}$

where:

$\mathrm J$ denotes the joule
$\mathrm s$ denotes the second.