The "energy efficiency" of a device is
A) the total energy put into the device divided by its useful energy output.
B) its useful energy output divided by the total energy put into the device.
C) its total energy output divided by the total energy put into the device.
D) its thermal energy output divided by the total energy put into the device.
E) the total energy put into the device divided by its thermal energy output.
Correct Answer:
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