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source(1) One side of a field effect transistor. See drain. source 1. a. a spring that forms the starting point of a stream; headspring b. the area where the headwaters of a river rise 2. anything, such as a story or work of art, that provides a model or inspiration for a later work 3. Electronics the electrode region in a field-effect transistor from which majority carriers flow into the interelectrode conductivity channel source [sȯrs] (electricity) The circuit or device that supplies signal power or electric energy or charge to a transducer or load circuit. (electronics) The terminal in a field-effect transistor from which majority carriers flow into the conducting channel in the semiconductor material. (mathematics) The vertex with indegree 0 that is specified in the definition of ans-tnetwork. (nucleonics) A radioactive material packaged so as to produce radiation for experimental or industrial use. (physics) In general, a device that supplies some extensive entity, such as energy, matter, particles, or electric charge. A point, line, or area at which mass or energy is added to a system, either instantaneously or continuously. A point at which lines of force in a vector field originate, such as a point in an electrostatic field where there is positive charge. (spectroscopy) The arc or spark that supplies light for a spectroscope. (thermodynamics) A device that supplies heat.
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