Twilight Universe
Would you like to react to this message? Create an account in a few clicks or log in to continue.

Power (physics)

Go down

Power (physics) Empty Power (physics)

Post by taixyz1992 Sat Nov 06, 2010 4:12 am


In physics, power is the rate at which work is performed or energy is converted[1][2]

If ΔW is the amount of work performed during a period of time of duration Δt, the average power Pavg over that period is given by the formula

P_\mathrm{avg} = \frac{\Delta W}{\Delta t}\,.

It is the average amount of work done or energy converted per unit of time. The average power is often simply called "power" when the context makes it clear.

The instantaneous power is then the limiting value of the average power as the time interval Δt approaches zero.

P = \lim _{\Delta t\rightarrow 0} P_\mathrm{avg} = \lim _{\Delta t\rightarrow 0} \frac{\Delta W}{\Delta t} = \frac{dW}{dt}\,.

In the case of constant power P, the amount of work performed during a period of duration T is given by:

W = PT\,.

In the context of energy conversion it is more customary to use the symbol E rather than W.

slot casino
sports betting odds

taixyz1992

Female
Number of posts : 100
Age : 33
General Location : Vietnam
Team Edward/Team Jacob? : Edward
Favorite Book Other Than Twilight : None
Registration date : 2010-08-29

Back to top Go down

Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum