Difference between revisions of "Power (Physics)"
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(New page: In physics, power refers to the rate of transfer of energy respect to time. Mathematically, average power is expressed as: P = W / Δt Therefore, power at any instant can b...) |
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Mathematically, average power is expressed as: | Mathematically, average power is expressed as: | ||
| − | P = W / Δt | + | P = ''W'' / Δt |
Therefore, power at any instant can be determined by the equation: | Therefore, power at any instant can be determined by the equation: | ||
| − | P = lim<sub>Δt->0</sub> W / Δt = dW / dt | + | P = lim<sub>Δt->0</sub> ''W'' / Δt = dW / dt |
| − | Since W = [[Force|F]] d[[distance|x]] and [[Velocity|v]] = dx / dt follows that: | + | Since d''W'' = [[Force|F]] d[[distance|x]] and [[Velocity|v]] = dx / dt follows that: |
P = F dx / dt = F v | P = F dx / dt = F v | ||
Revision as of 02:51, October 17, 2007
In physics, power refers to the rate of transfer of energy respect to time.
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 )