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Power

Power. Power. Rate at which work is done Power = Work/Time Can also be considered the rate at which energy is transformed Unit - J/s = 1 Watt (W) For larger quantities: 1 horsepower (hp) = 746 W. Example.

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Power

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  1. Power

  2. Power • Rate at which work is done • Power = Work/Time • Can also be considered the rate at which energy is transformed • Unit - J/s = 1 Watt (W) • For larger quantities: 1 horsepower (hp) = 746 W

  3. Example • A 70 kg jogger runs up a long flight of stairs in 4.0 sec. The height of the stairs is 4.5 m. A) what was the jogger’s power output in watts and horsepower? B) How much energy did it require?

  4. Another Derivation • P = W/ t • W = Fd • P = Fd/ t • v = d/t • d = vt • P = Fvt / t • P = Fv

  5. Example • Calculate the power required of a 1400 kg car A) as it climbs a 10º hill at 80km/hr. B) as it accelerates from 90km/hr to 110 km/hr in 6.0 s. The force of friction in each case is 700 N.

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