Question

1. which is not a characteristic of a heat pump? (1 point) it uses a refrigerant. it reverses the normal flow of thermal energy. it requires no work. it is used in air conditioners

Explanation:

A heat pump uses a refrigerant (like in air - conditioners), reverses the normal flow of thermal energy (from low to high temperature against the natural flow). According to the second law of thermodynamics, no heat pump can operate without work input.

Answer:

It requires no work.