In additionto performing arithmetic and logic operations on data, it times andcontrols the rest of the system. Mainframe and supercomputer CPUs sometimesconsist of several linked microchips, called microprocessors, each of whichperforms a separate task, but most other computers require only a singlemicroprocessor as a CPU. Input device: Components known as input devices let users enter commands,data, or programs for processing by the CPU. Output device: Components that let the user see or hear the results of thecomputer’s data processingMotherboard: a printed circuit board containing the principal components ofa microcomputer or other device, with connectors for other circuit boardsto be slotted into. Heat sink: a device for absorbing excessive or unwanted heat of thecomputer.
Fan: an apparatus with rotating blades that creates a current of air forthe computer. RAM: random-access memoryHard disk: a rigid non-removable magnetic disk with a large data storagecapacity. CD Rom: a compact disc used in a computer as a read-only device fordisplaying data. VGA: video graphics array, a standard for defining colour display screensfor computers.
Sound card: a device which can be slotted into a computer to allow the useof audio components for multimedia applications. Modem: a device for interconverting digital and analogue signals,especially to enable a computer to be connected to a telephone line. Itcan also be used to send data. Network card: Is used to operate with a network, to operate interactively;and toInteract with others to exchange information and develop useful contacts.