Power, Horsepower and Watts

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Power, Horsepower and Watts
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Power

• What is power?
• Power is defined as the rate of doing work.
• P Work/time
• Units lb?ft/sec or Joules/sec

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Horsepower

• What is Horsepower?
• Definition The common unit of measurement of an
  engine's power.
• One horsepower equals 550 foot-pounds per second
  (the power needed to lift 550 pounds one foot off
  the ground in one second or one pound 550 feet up
  in the same time)

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Horsepower
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Horsepower formula
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Watts and Power

• What is a watt?
• Definition A scientific unit of electrical
  power commonly used to describe the rate of
  energy consumption of an electrical appliance.
•  One Watt is the power equal to one joule of
  energy per second.
• Watts Work (Joule)/second

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Helpful conversions

• 1 Joule 1 N?m
• 1000 watts 1 kilowatt (kW)
• 1 horsepower (hp) .75 kW or 750 watts