Calculating the Input Energy for Leaf Battery Pack from a Power Plant

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catlady
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if the electrical energy stored in the leaf's battery pack came from a standard power plant and was delivered by a utility company ( like United Illuminated or Connecticut light and power) it was generated, transmitted, and transformed to the DC electricity that a battery can store at no more than 25% overall efficiency. Estimate how much energy in kilowatt-hours is consumed by the power plant (input energy) to let the leaf go one mile on the gollowing equation:

Input energy= output energy/efficiency

please help!
 
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You'll need to know the energy consumption rating for the car in order to determine the energy required to go one mile. Do you have that value?