Computer hardware are the physical component of the computer system that can be felt. They include Central Processing Unit (CPU), Monitor, Keyboard, Mouse, Speaker and so on. Computer hardware are of two variants, the input devices and the output devices.
These are the parts of a computer through which information is fed into the system. Instructions are sent to the computer through these devices. They include keyboard, mouse, joysticks, light pen, microphone and scanner.
USES OF A KEYBOARD
This device is like the keyboard of a type writer though with additional keys. The additional keys are used to perform operations that display things, clear the screen, edit and so on.
There are five types of keys on a keyboard. They are;
i) Alphabetical keys
ii) Control keys
iii) Special character keys and
iv) Function keys
USES OF MOUSE
This is a device, which looks like a kitchen mouse. It moves a pointer on the screen as we move it on a pad near the computer. Though, such movement commands are sent to the computer just as the keyboard does.
USES OF JOYSTICK
Joystick looks like the gear selector of a car and is used to enter data into the computer. It is commonly used when playing games on the computer.
USES OF LIGHT PEN
This is a pen like device with a light sensor at its writing tips. It receives information from the screen and feed it back into the computer memory.
This is the part of the system, which receives the processed information and presents the information in human readable form. These are the components through which one can print, read or hear what the computer has been able to do.
i) PRINTER: This is the equipment through which we receive a printed copy of our information or data on papers. There are many types of printers, they include Ink Jet, Laser and Line printer.
ii) MONITOR (Visual Display Unit): This displays processed information (output) on the computer.
iv) SOUND SPEAKERS: These produce output inform of sound to the user.
v) PLOTTER: This is used mainly to produce graphical output like graphs or pie charts.
DIFFERENCES BETWEEN INPUT AND OUTPUT DEVICES
Input devices are used to introduce data into the system while output devices are used to retrieve or get information from the computer system.