What is meant by useful output energy in an efficiency calculation?

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Multiple Choice

What is meant by useful output energy in an efficiency calculation?

The idea is that efficiency compares how much energy you put in to how much actually does the job you want. Useful output energy is the portion of input energy that is converted into the device’s intended form of work or function. In a lamp, that means the light you see (with some waste as heat). In a motor, it means the kinetic energy of motion (with losses as heat, friction, etc.). So the correct description is the energy that is converted into the desired form of work or function.

The idea is that efficiency compares how much energy you put in to how much actually does the job you want. Useful output energy is the portion of input energy that is converted into the device’s intended form of work or function. In a lamp, that means the light you see (with some waste as heat). In a motor, it means the kinetic energy of motion (with losses as heat, friction, etc.). So the correct description is the energy that is converted into the desired form of work or function.

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