Input(I/P)
The instruction or information is given to the computer is called input.
Set of devices used for providing information are called input devices or Input Units
Input devices List
- Keyboard:
- Mouse
- Scanner
- Joystick
- Webcam
- Microphone
- Digital camera
- Bio-metric devices etc
Note: Most used Input devices are Keyboard and Mouse
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| Keyboard and mouse (Most used input device) |
Keyboard:
Keyboard mainly consists four Main parts
- Standard type writer keys(A-Z)
- Numeric Keypad(0-9)
- Function keys(F1-F12)
- Special purpose keys
- Combinational keys: Alter, Shift and Control
- Toggle keys: Caps lock, Num lock and Scroll lock
- Navigation keys: Arrow keys ex- Up, Down, left, right
Mouse:
Mouse is a Pointing Device.
Types of mouse
- Optical Mouse: Also called laser mouse. At the help of the laser light mouse will be controlled.
- Mechanical mouse: In this mouse Track ball were used to control the mouse.
- Wireless mouse: This mouse has no wires, and these types of mouse runs on batteries.
Joystick
Joystick is an input device. Joystick is used to play games on computer.
Scanner:
Scanner is an input device: Scanner is used to scan photo or document into the computer.
Types of scanner
- Flatbed scanner
- Portable Scanner
- OCR (Optical character recognition)
- OMR (Optical mark recognition)
- MICR (Magnetic ink Character Recognition)
Output(O/P) devices
After the process we get result result in the form of output. Set of devices used for providing Result or information are called output device.
- Monitor
- Printer
- Plotters
- Speaker
- Projector
- Headphone etc
Note: Most common used Output devices are Monitor and Printer
Monitor
The output of the monitor is called soft copy. The output displays on the monitor is generated with dot, and each dot is called Pixel. The distance between two pixel is called dot pitch.
Types of monitor
1. CRT monitor (Cathode Ray Tube)
It is heavy in weight
It takes more space
It consume more power
2.LCD (Liquid crystal Display)
It is light in weight
It need less space
Takes less power
Printer
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| Printer |
The output of the printer is called Hard copy
Printer Resolution measured in DPI(Dot per inch)
Printer Types
- Laser Printer: Tonner(powder) for the printing
- Inkjet Printer: Ink will be used for the printing
- Dot matrix printer: Small pins will be used for the printing
- Thermal printer: We can see Thermal Printers at ATM machine, petrol pump etc
- Plotters: Plotters will be used to print maps or drawing of the Architecture or Engineer