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# Power - PowerPoint PPT Presentation

Power. Work has to do with a force causing a displacement . It has nothing to do with the amount of time that this force takes to cause the displacement. Consider a rock climber… he may ascend a few meters very slowly.

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## PowerPoint Slideshow about 'Power' - sydnee

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### Power

• Work has to do with a force causing a displacement.

• It has nothing to do with the amount of time that this force takes to cause the displacement.

P = W/t slowly.

P- Power

W- Work

t- time

• W= slowly.Fd (when force and displacement vectors are in the same direction)

• P= W/t

• P= Fd/t

• d/t = v

So………

P =Fv

• Unit of measurement for power: the slowly.Watt (W).

• 1 Watt = 1 J/s = 1 kg m2/s3

• Named after James Watt (b. 1736), an engineer whose improvements to the steam engine were very important to the Industrial Revolution.

• You often see power measure in slowly.horsepower

• 1 horsepower (hp) = 746 W

• The term was adopted in the late 18th century by James Watt to compare the output of steam engines with the power of draft horses

Example slowly.

• A 70 kg jogger runs up a long flight of stairs in 4.0 s. The vertical height of the stairs is 4.5 m. Estimate the jogger’s power output in both watts and horsepower.