# Physics Assignment Help With Power

## Power Assignment Help

Power is defined *as the rate at which work is done*. If an amount of work D*W* is done in a time interval D*t*, then the average power is defined to be

*Pav* =

The *SI *unit of power is J/s which is given the name watt (W) in the honour of *James Watt*.

Thus, **1 W = 1 J/s. **

The *instantaneous *power is the limiting value of *Pav *as D*t* ® 0; that is

*P *=

The work done by force *F* on a object that has an infinitesimal displacement *d* is

dW = Since the velocity of the object is , the instantaneous power may be written as *P* = =

or *P* =

Since the work and energy are closely related, a more general definition of power is the *rate of energy transfer from one body to another*, or *the rate at which energy is transformed from one form to another.*

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