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Unformatted text preview: th around the circuit element for the high current. Appendix C: The Thermocouple A battery can convert chemical energy (a name referring to the energy available due to the electric forces binding atoms and molecules together) into electric energy (a name meaning speciMically that the source of energy can be utilized to move electric charges). It is also possible under special circumstances to convert thermal energy into electric energy, the source once again being the difference in binding energies of the electrons to the atoms of the two different metals. A thermocouple can be formed by joining the ends of almost any two different metals. Common ones in use are copper- iron, copper- Constantan, and Chromel- Alumel thermocouples. (The latter three names are alloys, mixtures of different metals). If the two fused ends in the diagram are at different temperatures, a potential difference will exist between the two ends, and a current i will PHY 2141/2181 EXP # 4 6 Mlow.2 If the...
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