The atom consists of a nucleus, where most of the mass of the atom is concentrated, with electrons in orbits around the nucleus. The electrons are negatively charged. In a material that is an electrical conductor, such as copper, aluminum, and a number of other metals, it is possible for certain of the electrons to move from atom to atom along the conductor. The force that can cause these electrons to move along the conductor is called a voltage, or electromotive force (emf).
KeywordsCombustion Furnace Dioxide Depression Petroleum
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