Power (Physics)

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In physics, power refers to the rate of transfer of energy respect to time.[1]

Mathematically, average power is expressed as:

P = W / Δt

Therefore, power at any instant can be determined by the equation:

P = limΔt->0 W / Δt = dW / dt

Since dW = F dx and v = dx / dt follows that:

P = F · dx / dt = F · v

The usual units for power are Watts ( W = J/s ) and horsepower ( hp = 746 W )


  1. Serway and Beichner, Physics For Scientists and Engineers, Fifth Edition