Work

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Power

• Page 262

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In physics

• Work is the transfer of mechanical energy.
• Power is
• the rate at which work is done.
• or the rate at which energy is transferred.

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Power is calculated as

• Work (W) and energy transfer (E) are in joules
  (J).
• Time interval t is in seconds (s).
• Power (P) is in watts (W).
• 1 watt is equivalent to 1 joule per second.
• Be careful with work (W) and watt (W).

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• Where do you see watts, or talk about power?
• 746 watts is the equivalent of 1 horsepower.

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