An electrical bus (sometimes spelled incorrectly as 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 electric 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.
• In pro audio, "bus" refers to a place in the audio signal chain where one can hear a mix of different audio signals—usually at the output of a mixer, or as a separate sub-mix within the mixer (for example all of the microphones used to capture a drum kit). Sometimes it is used interchangeably with the noun "mix".

See also

• distributed generation
• Switched-mode power supply; SMPS
• isolated-phase bus.
• Busbar