Question

match the terms to the descriptions.
instructions
heat engine
heat pump
it must use mechanical energy to move heat from a cold area to a hot one. it can generate mechanical energy from the flow of heat from a hot area to a cold one
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Explanation:

• A heat engine operates by taking heat from a hot reservoir, converting some of it into mechanical work (generating mechanical energy), and expelling the remaining heat to a cold reservoir. So, the description “It can generate mechanical energy from the flow of heat from a hot area to a cold one” matches the heat engine.
• A heat pump, on the other hand, requires an input of mechanical energy (or electrical energy which is a form of mechanical - like energy in this context) to move heat from a cold region (like the outside air in winter for heating a house) to a hot region (the inside of the house). So, the description “It must use mechanical energy to move heat from a cold area to a hot one” matches the heat pump.

Answer:

Heat engine: It can generate mechanical energy from the flow of heat from a hot area to a cold one.
Heat pump: It must use mechanical energy to move heat from a cold area to a hot one.