Question

which best explains how a heat pump can heat a room? cold air from the house is moved through pipes, where it absorbs thermal energy. warm air from outside is pushed into the house to replace the cold air. combustion warms the air when chemical energy is transferred to thermal energy. fuel is used to move a piston, which pushes warm air into the house.

Explanation:

A heat pump works by taking heat from a cold space (like the cold air in the house) and transferring it to a warm space. The first option correctly describes this process where cold air from the house is moved through pipes (where a refrigerant absorbs thermal energy from the cold air, and then releases it inside the house after compression - a basic heat - pump principle). The second option is incorrect as heat pumps don't just push warm outside air (they can work even in cold outside temperatures). The third option is about combustion (like in a furnace, not a heat pump). The fourth option is about a piston - based mechanism (not related to heat - pump operation).

Answer:

Cold air from the house is moved through pipes, where it absorbs thermal energy.