The energy transferred between objects at different temperatures always flows from hot to cold.

• A. Electrical energy
• B. Potential energy
• C. Heat
• D. Mechanical energy

Answer: (C)

Heat is the energy transfer that occurs between objects with different temperatures. When there’s a temperature difference, energy naturally moves from the warmer object to the cooler one until both reach the same temperature. This transfer is what we call heat, and it describes the process of energy in transit, not a stored quantity in the objects themselves. The other options are names for types of energy that objects can possess or exchange in other ways (electrical, potential, mechanical), but they aren’t the specific process described by energy moving between objects because of a temperature difference. Heat can move by conduction, convection, or radiation, and that’s why you observe warming of one object as another loses heat.