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Basic Energy Units, Terms and Calculations

Basic Energy Units, Terms and Calculations

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A $150 garage door opener has a ½ hp motor with a motor efficiency of 20%. Motor efficiency is the same as mechanical efficiency because it represents the fraction of electrical work input converted to mechanical shaft work output. An open/close cycle takes 20 s and electricity costs 8¢ kWh. A car at idle

  Doors, Garage, Reopen, Garage door opener

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