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Unit 5: Computer Hardware

Digital Camera Input Device Used to record images in an electronic format
Notes
Touch screen Input Device Used to point to a selection.
Light Pen Input Device Used to select a menu item or draw figure on the
monitor screen
Trackball Input Device Pointing device that works like a mouse.
Joystick Input Device Pointing device used in CAD and playing games on a
PC.
Digitizer Input Device Used to create drawings and pictures
OMR Input Device Optical scanner used to recognise the type of make
made by pen or pencil
OCR Input Device Optical scanner, used to detect typed or printed
characters.
Bar Code Reader Input Device Used to read bar-coded data generally found on goods.
MICR Input Device Used to recognise the magnetically charged character
found mainly on cheques.
Monitor Output Device Standard device of all PCs for displaying information
on screen.
Printer Output Device Standard device for all computers for printing
information on Papers.
Speaker and Output Devices Used to hear sound and music on a multimedia
Headphone computer on Internet
Plotter Output Device Used to print high equality drawings
COM Output Device Used to produce output on a microfilm media.

Self Assessment

Fill in the blanks:
1. Keyboard is the main basic ...... of a computer.
2. Bar code Reader is used for reading data in the form of light and ...... .
3. Digitizer is used to create drawings and pictures using a ...... .
4. Monitor is the basic ...... of a computer.

5.4 Summary
• Keyboard is the main basic input device of a computer. It is the most commonly used means
by which you can communicate with a computer.
• Microphone converts sound waves into analog electrical signals, which are further converted
to digital form in a PC.
• Scanner is widely used in Desktop Publishing (DTP) applications. It is used for digitising
images such as photographs, forms, documents, etc. into computer memory.
• Digital Camera is a type of camera that records images in an electronic format, storing the
images either on a disk or on a special memory, called flash memory.
• Optical mark reader is a special type of optical scanner used to recognise the type of mark
made by pen or pencile.

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