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active backplane — A type of backplane system in which there is some circuitry, including bus connectors, buffers, and driver circuits, on the backplane.
alternating current (AC) — Current that cycles back and forth rather than traveling in only one direction. In the United States, the AC voltage from a standard wall outlet is normally between 110 and 115 V. In Europe, the standard AC voltage from a wall outlet is 220 V.
ammeter — A meter that measures electrical current in amps.
ampere or amp (A) — A unit of measurement for electrical current. One volt across a resistance of one ohm will produce a flow of one amp.
AT — A form factor, generally no longer produced, in which the motherboard requires a full-size case. Because of their dimensions and configuration, AT systems are difficult to install, service, and upgrade. Also called full AT.
ATX — The most common form factor for PC systems presently in use, originally introduced by Intel in 1995. ATX motherboards and ca...