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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.
Heat in the electrical distribution system is a major source of electrical losses in. facilities. Wire is the heart of the distribution system and a major source of heat. High frequency noise in the range of 1kHz-1.5MHz is responsible for skin effect and. proximity effect in wire. Skin effect and proximity effect are major contributors to heat.