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Definition of "Arc Fault Circuit Interrupter" |
[AFCI] An AFCI acts like a circuit breaker, interrupting the circuit when a high energy arc is detected. Low energy arcs which are common when changing a switch position or plugging in a device are ignored. Because an AFCI device is designed to detect an arc, the arc must occur first, so an AFCI will never interrupt a circuit until after the first arc. An AFCI may also be combined with a GFCI for ground fault protection, or a circuit breaker for overload and short-circuit protection. An AFCI outlet may have a test switch just as a GFCI outlet. / Arc Fault Circuit Interrupter is a circuit breaker designed to prevent fires by detecting an unintended electrical arc and disconnecting the power before the arc starts a fire. An arc fault circuit interrupter must distinguish between a harmless arc that occurs incidental to normal operation of switches, plugs and brushed motors and an undesirable arc that can occur, for example, in a lamp cord that has a broken conductor in the cord. / Common-Source FET is one of three basic single-stage field-effect transistor amplifier topologies, typically used as a voltage or transconductance amplifier. The easiest way to tell if a FET is common source, common drain, or common gate is to examine where the signal enters and leaves. The remaining terminal is what is known as "common". In this example, the signal enters the gate, and exits the drain. The only terminal remaining is the source. This is a common-source FET circuit. The analogous bipolar junction transistor circuit is the common-emitter amplifier. |
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