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Thermal energy is generated and measured by heat of any kind. It is caused by the increased activity or velocity of molecules in a substance, which in turn causes temperature to rise accordingly.
There are many natural sources of thermal energy on Earth, making it an important component of alternative energy.

Thermal energy - Wikipedia

en.wikipedia.org/wiki/Thermal_energy

In thermodynamics, thermal energy refers to the internal energy present in a system due to its temperature. The concept is not well-defined or broadly accepted ...

Heat Energy - Definition and Examples - About Physics

physics.about.com/od/glossary/g/heat.htm

Jul 28, 2016 ... This is the definition of heat or thermal energy, particularly as the term applies to physics. Examples of heat energy are provided.

heat energy - Dictionary Definition : Vocabulary.com

www.vocabulary.com/dictionary/heat energy

a form of energy that is transferred by a difference in temperature.

Heat - Wikipedia

en.wikipedia.org/wiki/Heat

It regards quantity of energy transferred as heat as a primitive concept ...

Heat energy | Sciencelearn Hub

sciencelearn.org.nz/Contexts/Fire/Science-Ideas-and-Concepts/Heat-energy

Nov 20, 2009 ... Heat is needed to keep a fire going. It involves the flow of energy between matter in three ways – convection, conduction and radiation.

Why does electrical current make heat?

www.qrg.northwestern.edu/projects/vss/docs/thermal/3-why-does-electrical-current-make-heat.html

Electrical current is the flow of electrons through a substance that will permit that ... When electron flow is resisted, some of the energy in the electrons does not ...

Electric heating - Wikipedia

en.wikipedia.org/wiki/Electric_heating

Electric heating is a process in which electrical energy is converted to heat. Common .... However, this waste heat becomes a liability when using air conditioning. .... Electric heating processes a...

Electrical Energy to Thermal Energy Conversions Examples

www.softschools.com/examples/science/electrical_energy_to_thermal_energy_conversions_examples/5/

Electrical energy is a form of energy that occurs as a result of either stored or moving charged particles. When the energy is stored it is called electric potential  ...