A computer is made up of a collection of different components that are interconnected together in order to work as a single entity.
A Computer consists of the following parts/devices: -
1. The System Unit.
2. Input devices.
3. Output devices.
4. Storage devices.
This is the casing (unit) that houses electronic components such as the ‘brain’ of the computer called the Central processing Unit (CPU) and storage devices.
The components in the System unit include: -
There are two makes of System units:
This system unit is made to stand alone. They are designed to be placed on the floor.
Tower style units have more space for expansion than the typical desktop units.
Desktop units lie on the desk with the monitor resting on top of the system unit.
Features of the System unit.
Examples: Keyboard, Mouse, Joysticks, Light pen, Scanner, etc.
The keyboard looks like a typewriter, and has letters, numbers and other keys through which data is entered into the computer.
To enter data & instructions into the computer, the user should press the required keys.
It is a pointing device that enables the user to issue instructions to the computer by controlling a special mouse pointer displayed on the screen.
It is a television like screen used for displaying output. When you type a letter or number on the keyboard, it shows up on the monitor.
Note. The monitor enables the user to monitor/track or see what is going on in the computer.
Printers are used to create permanent copies of output on paper.
A computer is basically made up of a system unit and other devices connected to the system unit called Peripheral devices.
Peripheral devices are the elements (components) connected to the system unit so as to assist the computer satisfy its users.
Peripheral devices are connected to the System unit using special cables called data interface cables that carry data, programs & information to and from the processor. The cables are connected to the system unit using connectors called Ports.
Examples of peripheral devices include;
Monitor, - Keyboard, - Mouse
Printer. - Modem. Speakers.
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