<P> A power strip (also known as an extension block, power board, power bar, plug board, trailing gang, trailing socket, plug bar, trailer lead, multi-socket, multiple socket, multiple outlet, polysocket and by many other variations) is a block of electrical sockets that attaches to the end of a flexible cable (typically with a mains plug on the other end), allowing multiple electrical devices to be powered from a single electrical socket. Power strips are often used when many electrical devices are in proximity, such as for audio, video, computer systems, appliances, power tools, and lighting . Power strips often include a circuit breaker to interrupt the electric current in case of an overload or a short circuit . Some power strips provide protection against electrical power surges . Typical housing styles may include strip, rack - mount, under - monitor and direct plug - in . </P> <P> Some power strips include a master switch to turn all devices on and off . This can be used with simple devices, such as lights, but not with most computers, which must use shutdown commands from the software . Computers may have open files, which may be damaged if the power is simply turned off . </P> <P> Some power strips have individually switched outlets . </P>

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