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1 When the burner of a stovetop is very hot, it is a source of heat energy. 2  Anything placed onto the stovetop and warmed, whether a pot of tea or a skillet for frying eggs, also become sources of heat energy. 3  Automobile fuels such as gasoline are sources of heat energy, as is the hot engine of a racecar or a school bus.
The sun is the source of all energy, heat and light. The amount of sunlight in an area determines what living thing can survive there. For example, the upper part of the sea or ocean receives a lot of sunlight. It is therefore warmer than the ocean floor, which has little or no light at all.