Efficient device uses chemical energy to generate

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A 45% efficient device uses chemical energy to generate 420 J of electric energy.

How much chemical energy is used?

 

A second device uses twice much chemical energy to generate half as much electric energy. What is its efficiency?

Reference no: EM13659574

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Efficient device uses chemical energy to generate : A 45% efficient device uses chemical energy to generate 420 J of electric energy. How much chemical energy is used? A second device uses twice much chemical energy to generate half as much electric energy. What is its efficiency?
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