Power Definition

In physics, the amount of energy carried by an object in unit time is called power. To calculate the power SI unit used to represent is Watt (w), equal to the joules per second (J/s). As the power depends on the work done by an object, it is a scalar quantity. Moreover, you may see a device having a Horsepower (hp) because the motor vehicle and machine's power is measured in HP, whereas 745 watts are equivalent to 1HP.


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Formula of Power

To find out the power instantly, you can use our free online power calculator. Or to find it manually, you can use the formula listed below:

P = W / T


P = Power

W = Work

T = Time


If you want to calculate the power, you can use our Power Calculator.


For a more precise understanding of the concept, let us solve an example below:

Suppose a truck has work done of 7000 Joules in 3 minutes, then find out the power applied.

Given data

Work = 7000 J
Time = 3 min = 180 sec

To Find

Power = ?


To find out the power consumed by a truck, we will use the formula listed below:

P = W / T

Putting values in the formula:

P = 7000 / 180 = 38.88 J/s