Difference between revisions of "Power (Physics)"

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 = lim_Δt->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 )

@@ Line 1: / Line 1: @@
-In physics, power refers to the rate of [[Work|transfer of energy]] respect to [[time]].
+In physics, '''power''' refers to the rate of [[Work|transfer of energy]] respect to [[time]].<ref>Serway and Beichner, ''Physics For Scientists and Engineers'', Fifth Edition</ref>
 Mathematically, average power is expressed as:
-P = W / Δt
+P = ''W'' / Δt
 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
 The usual units for power are [[Watts]] ( W = [[Joule|J]]/[[seconds|s]] ) and [[horsepower]] ( hp = 746 W )
+==References==
+<references/>
 [[Category:Physics]]
+[[Category:Mechanics]]