Difference between revisions of "Power (Physics)"
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Latest revision as of 15:42, June 29, 2016
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 )
References
- ↑ Serway and Beichner, Physics For Scientists and Engineers, Fifth Edition