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Input and Output Devices

Input and Output Devices

With respect to class 3 Input and Output Devices, all computers have four basic building blocks for processing.

They are –

  • Input devices
  • Output devices
  • Storage devices
  • Central Processing Unit (CPU)

 

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Difference between Input and Output Devices

 

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Input devices –

  • With respect to class 3 computer lessons, an input device is used to feed data to the computer system.
  • The data is then used for processing.
  • These data are then sent to the Central Processing Unit for processing.

 

Few input devices

 

Keyboard

  • With respect to class 3 Input and Output Devices, a keyboard, which looks like a typewriter, is the most common input device of a Computer System.
  • Keyboards have the combination of letters and numeric keys.
  • We can also keys for volume control, Play / Pause videos etc.
  • These keyboards help to capture the data and send it to CPU.

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Mouse

  • With respect to class 3 Input and Output Devices, to scroll through the monitor screen, a mouse is another commonly used input device.
  • It is the cursor on the screen.
  • It has two buttons, the left and right clicking buttons and a wheel in the centre for scrolling.
  • There are two types of Mouse, one type has a rubber-covered ball at the bottom or using optical sensor.0
  • As the mouse is slid on a surface, the ball rolls, resulting in movement of the cursor on the screen.

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Scanner

  • With respect to class 3 computer lessons, the third important input device of a computer system is a scanner.
  • With the help of a scanner, the printed documents are converted to images.
  • We have black & white and also colour scanners.
  • It works the same way as a Photocopier.

 

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Digital Camera

  • Digital Cameras are used to capture images.
  • We can transfer these images to our computer.

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Output devices –

  • The processed information has to be displayed.
  • To display this information, there need to be some ‘output devices’. A very useful output device is a VDU (or Visual Display Unit) or a printer.

 

With respect to class 3 computer lessons, few output devices

Monitor

  • Every computer will have a monitor.
  • It is the display screen of a computer.
  • Cathode Rays Tube (CRT) and Liquid Crystal Display (LCD) are the two types of Monitors.
  • LCD is getting popular because of its slim size and flat screen.

 

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Printers

  • With respect to class 3 Input and Output Devices, printers help to get the text/images on a paper.
  • We have varieties of printers for various purposes.
  • Out textbooks are printed using printers.
  • We have black & white printers and also colour printers.

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Speakers

  • To hear the audio/video file from a computer we need speakers.
  • Few systems have built-in speakers and are small in size.
  • Big speakers, woofers & sub-woofers are used to enhance sound quality or creating a mini home theatre.

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 Recap

Input and Output Devices

Computer's four basic building blocks for processing

With respect to class 3 Input and Output Devices, the difference between Input and Output Devices

  • Input devices – An input device is used to feed data to the computer system.
  1. Keyboard
  2. Mouse
  3. Scanner
  4. Digital camera

 

  • Output devices – The processed information has to be displayed.
  1. Monitor
  2. Printer
  3. Speaker

Quiz for Input and Output Devices

Q.1

Caps lock is a ____________.

a)

symbol key

b)

special key

c)

number key

d)

All of these

Q.2

The mouse is connected to which part?

a) Monitor
b) Keyboard
c) UPS
d) CPU

Q.3

The mouse is generally made of:

a) 2 buttons
b) 3 buttons
c) 2 buttons and a wheel in between
d) all of these

Q.4

The mouse is used to:

a) point
b) select
c) move
d) all of these

Q.5

The symbol on the screen that moves with moving the mouse is called:

a)

 Cursor

b)

Keyboard keys

c)

Linker

d)

None of them

Q.6

The output printed on paper is called:

a)

Soft copy

b)

Hard copy

c)

Input

d)

None of them

Q.7

Which device gets the information from a computer onto a paper?

a) joystick
b) sound box
c) printer
d) monitor

Q.8

The physical parts of a computer which you can touch and see are called:

a)

Software

b)

Hardware

c)

System

d)

Application

Q.9

The parts which are found inside the CPU are:

a) Hard disk
b) CPU chip
c) Floppy disk holder
d) All of these

Q.10

Hardware is classified into three parts. They are:

a) input, storage and output
b) input, processing and storage
c) input, processing and output
d) processing, output and storage

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