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Heat energy is determined by how active the atoms or molecules are in a substance. The atoms and molecules in a hot substance move rapidly and seem excited while the molecules and atoms in a cool substance show less movement.


The uses of heat are nearly limitless, although examples include ovens, home heating systems, metalwork, and various kinds of engines. It should be noted that heat is not a kind of energy but rather the transfer of energy from one thing to another.


Non-renewable and renewable energy sources are the two types of energy. As the names state, non-renewable sources such as fossil fuels are not able to be used again. Renewable sources such as wind can be used over and over again.


Examples of heat energy include electrical stoves, hairdryers, a just-sharpened pencil and sun rays. Heat, or thermal energy, is typically converted from mechanical, electrical or chemical energy.


Heat differs from thermal energy in that heat is the transfer of thermal energy from one location, object or substance to another. Thus, heat is a process that happens to thermal energy and is meaningless without it. Thermal energy is the random kinetic energy of the co...


A few examples of heat sources are the sun, friction, chemical reactions and the earth. The sun is a natural heat source that is renewable and that can be converted into electricity.


In areas where winters and summers are fairly mild, heat pumps offer an affordable alternative to other heating and cooling systems. As temperatures become more extreme, however, their advantages wane.