Question

1. which is not a characteristic of a heat pump? (1 point)

it reverses the normal flow of thermal energy.
it requires no work.
it uses a refrigerant.
it is used in air conditioners.

Explanation:

To determine which is not a characteristic of a heat pump, we analyze each option:

• A heat pump reverses the normal flow of thermal energy (moves heat from cold to hot), so "It reverses the normal flow of thermal energy" is a characteristic.
• Heat pumps require work (energy input, e.g., electrical work) to operate. The statement "It requires no work" is incorrect for a heat pump.
• Heat pumps use a refrigerant to transfer heat, so "It uses a refrigerant" is a characteristic.
• Heat pumps are used in air conditioners (for cooling, by reversing the cycle), so "It is used in air conditioners" is a characteristic.

Answer:

B. It requires no work