Input and Output Devices

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Input and Output devices Keyboard: One of the main input devices used on a computer. The computer is incomplete with out a keyboard.A PC's keyboard looks very similar to the keyboards of electric typewriters, with some additional keys. Below is a graphic of a keyboard with some information. Finally, today most users use the QWERTY style keyboards. Below is a graphic illustration of where each of the keys are on a QWERTY style keyboard. Numeric Pad: A numeric keypad, numpad or tenkey for short, is the small, palm-sized, seventeen key section of a computer keyboard, usually on the very far right. The numeric keypad features digits 0 to 9, addition (+), subtraction (−), multiplication (*) and division (/) symbols, a decimal point (.) and Num Lock and Enter keys. It also provides a calculator-style keyboard for efficient entering of numbers .Below is garphic of a numeric pad. Numeric keypads usually operate: when Num Lock is off, keys 8, 6, 2, 4 act like an arrow keys and 7, 9, 3, 1 act like Home, PgUp, PgDn and End; when Num Lock is on, digits keys produce corresponding digits. Mouse: There are two types of mouse 1) Laser mouse and 2) Optical mouse.In computing, a mouse is a pointing device that functions by detecting two-dimensional motion relative to its supporting surface. Physically, a mouse consists of an object held under one of the user's hands, with one or more buttons. It sometimes features other elements, such as "wheels", which allow the user to perform various system-dependent operations. Touch Pad: A touchpad (also trackpad) is a pointing device consisting of specialized surface that can translate the motion and position of a user's fingers to a relative position on screen. They are a common feature of laptop. Touchpads operate in one of several ways, including capacitive sensing and conductance sensing. The most common

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