Physical effects that link heat, stress or friction to electric charge, namely thermionic emission, pyroelectricity, piezoelectricity, the thermoelectric effect and the triboelectric effect. A topic belongs here when its cited article defines one of these effects. Each of these effects ties electricity to another physical change, heat, pressure or contact, and each is the working principle of a class of sensors, generators or harvesters. A topic is placed here when the cited article defines the effect and not a device that uses it.
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Thermoelectric and Charge Effects
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Wikipedia: Thermionic emission
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Thermionic emission is the liberation of charged particles from a hot electrode whose thermal energy gives some particles enough kinetic energy to escape the material's surface.
Wikipedia: Pyroelectricity
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Pyroelectricity (from Greek: pyr (πυρ), "fire" and electricity) is a property of certain crystals which are naturally electrically polarized and as a result contain large electric fields.
Wikipedia: Piezoelectricity
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Piezoelectricity (, US: ) is the electric charge that accumulates in certain solid materials-such as crystals, certain ceramics, and biological matter such as bone, DNA, and various proteins-in response to applied mechanical stress.
Wikipedia: Thermoelectric effect
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The thermoelectric effect is the direct conversion of temperature differences to electric voltage and vice versa via a thermocouple.
Wikipedia: Triboelectric effect
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The triboelectric effect (also known as triboelectricity, triboelectric charging, triboelectrification, or tribocharging) describes electric charge transfer between two objects when they contact or slide against each other.
Wikipedia: Thermoelectric materials
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Thermoelectric materials show the thermoelectric effect in a strong or convenient form.
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