When heat transfers into a system, is the energy stored as heat? Explain briefly.

2 answers

Generally yes, when you cook something the temperature goes up, storing heat that can be released later when the fire goes out.
Not necessarily. Energy is what is stored into a system by heat. It might be stored as different kinds of energy such as chemical energy, radiant energy, or kinetic energy to name a few. Heat is the spontaneous transfer of energy due to a temperature difference.