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21 June, 13:36

What is power in physics

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  1. 21 June, 17:27
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    In physics, power is the rate of doing work or of transferring heat, i. e. the amount of energy transferred or converted per unit time. Having no direction, it is a scalarquantity. In the International System of Units, the unit of power is the joule per second (J/s), known as the watt in honour of James Watt, the eighteenth-century developer of the condenser steam engine. Another common and traditional measure is horsepower (comparing to the power of a horse). Being the rate of work, the equation for power can be written:

    Power

    Common symbols

    Derivations from

    other quantities

    P = E/t

    P = F·v

    P = V·I

    P = T·ω

    As a physical concept, power requires both a change in the physical system and a specified time in which the change occurs. This is distinct from the concept of work, which is only measured in terms of a net change in the state of the physical system. The same amount of work is done when carrying a load up a flight of stairs whether the person carrying it walks or runs, but more power is needed for running because the work is done in a shorter amount of time.
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