ELECTRICAL BUS

An 'electrical bus' (sometimes spelled ''buss'') is a physical electrical interface where many devices share the same electric connection. This allows signals to be transferred between devices (allowing information or power to be shared). A bus often takes the form of an array of wires that terminate at a connector which allows a device to be plugged into the bus.

★ Buses are used for connecting components of a computer: a common example is the PCI bus in PCs. See computer bus.

★ Buses are used for communicating between computers (often microprocessors). See computer bus.

★ Buses are used for distribution of electrical power to components of a system. The (usually) thick conductors used are called busbars. In an electrical laboratory, for example, a bare bus-bar will sometimes line the wall, to be used by the engineers and technicians for its high electrical current carrying capacity, which allows a convenient approximation to ''zero voltage'', or ''ground'' in the US, and ''earth'' in the UK.

★ In analysis of an electric power network a "bus" is any node of the single-line diagram at which voltage, current, power flow, or other quantities are to be evaluated. These may or may not correspond with heavy electrical conductors at a substation.
See also distributed generation, Switched-mode power supply; SMPS.