Textbook: Input and Output Devices | Computer Science for Class 2 PDF Download

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Tejas: When I draw using a mouse, the drawing actions are the input. 
When the computer prints the drawing, the printout is the output.
Moz: Correct. What did you use to give the command to print?
Tejas: The mouse. I clicked on the print icon.
Moz: The command given using the mouse is an input.  So the mouse 
is an input device.
Jyoti [holding a Marigold flower]: Moz, this flower 
from my garden is for you.
Tejas [holding a printout of a painting]: Moz, this 
painting from the computer is for you.
Moz: Thanks. A plant takes in water and 
gives flowers. Taking in is called Input.  Giving out 
is called Output. Water is the input and flowers 
are the output for the plant. Can you give an 
example of an input and an output for a computer?
In this lesson you will learn:
About Input and Output concepts.
Some examples of Input and Output devices.
Lesson2
Input and Output Devices
CONCEPTS
Input devices allow us to send information to the 
computer. Input to the computer is usually given by 
clicking the mouse or typing on the keyboard.  
Input 
Output 
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Tejas: When I draw using a mouse, the drawing actions are the input. 
When the computer prints the drawing, the printout is the output.
Moz: Correct. What did you use to give the command to print?
Tejas: The mouse. I clicked on the print icon.
Moz: The command given using the mouse is an input.  So the mouse 
is an input device.
Jyoti [holding a Marigold flower]: Moz, this flower 
from my garden is for you.
Tejas [holding a printout of a painting]: Moz, this 
painting from the computer is for you.
Moz: Thanks. A plant takes in water and 
gives flowers. Taking in is called Input.  Giving out 
is called Output. Water is the input and flowers 
are the output for the plant. Can you give an 
example of an input and an output for a computer?
In this lesson you will learn:
About Input and Output concepts.
Some examples of Input and Output devices.
Lesson2
Input and Output Devices
CONCEPTS
Input devices allow us to send information to the 
computer. Input to the computer is usually given by 
clicking the mouse or typing on the keyboard.  
Input 
Output 
Output devices allow us to receive information from the 
computer. Output from the computer may be printouts from the 
printer, sounds on the speaker, or images on the monitor.
Output
Moz: From which device did you get the 
output?
Jyoti: Printer! So the printer must be 
an output device.
Tejas: Whatever we type using the keyboard, appears on the 
monitor. So the keyboard is an input device and the 
monitor is an output device. 
Moz: Right, the commands you type are the input and 
what you see on the monitor is the output.
Jyoti: When we paint using the computer, the painting 
can be seen on the monitor. So the paint actions that we do 
using the mouse are the input. The painting shown on the monitor is 
the output.
Moz: Yes. The mouse pointer, words, numbers, painting, and 
everything that is seen on the monitor is the output.
Moz [plays a song on the computer]: Now tell 
me what is the input and output?
Tejas: The song that we hear is the output. 
Jyoti: We hear the songs from the speakers. 
So speakers are output devices.
Moz: Correct. What about the input? 
Jyoti: You clicked on the song icon using the 
mouse.This clicking is the input.
Tejas: So the mouse is the input device.
Jyoti: During the holidays, I saw a movie on the computer. The 
picture was on the monitor and the sound came through the speakers. 
That means, both the monitor and the speakers were giving the 
output at the same time! 
Moz: You are right.
Output
CONCEPTS
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Tejas: When I draw using a mouse, the drawing actions are the input. 
When the computer prints the drawing, the printout is the output.
Moz: Correct. What did you use to give the command to print?
Tejas: The mouse. I clicked on the print icon.
Moz: The command given using the mouse is an input.  So the mouse 
is an input device.
Jyoti [holding a Marigold flower]: Moz, this flower 
from my garden is for you.
Tejas [holding a printout of a painting]: Moz, this 
painting from the computer is for you.
Moz: Thanks. A plant takes in water and 
gives flowers. Taking in is called Input.  Giving out 
is called Output. Water is the input and flowers 
are the output for the plant. Can you give an 
example of an input and an output for a computer?
In this lesson you will learn:
About Input and Output concepts.
Some examples of Input and Output devices.
Lesson2
Input and Output Devices
CONCEPTS
Input devices allow us to send information to the 
computer. Input to the computer is usually given by 
clicking the mouse or typing on the keyboard.  
Input 
Output 
Output devices allow us to receive information from the 
computer. Output from the computer may be printouts from the 
printer, sounds on the speaker, or images on the monitor.
Output
Moz: From which device did you get the 
output?
Jyoti: Printer! So the printer must be 
an output device.
Tejas: Whatever we type using the keyboard, appears on the 
monitor. So the keyboard is an input device and the 
monitor is an output device. 
Moz: Right, the commands you type are the input and 
what you see on the monitor is the output.
Jyoti: When we paint using the computer, the painting 
can be seen on the monitor. So the paint actions that we do 
using the mouse are the input. The painting shown on the monitor is 
the output.
Moz: Yes. The mouse pointer, words, numbers, painting, and 
everything that is seen on the monitor is the output.
Moz [plays a song on the computer]: Now tell 
me what is the input and output?
Tejas: The song that we hear is the output. 
Jyoti: We hear the songs from the speakers. 
So speakers are output devices.
Moz: Correct. What about the input? 
Jyoti: You clicked on the song icon using the 
mouse.This clicking is the input.
Tejas: So the mouse is the input device.
Jyoti: During the holidays, I saw a movie on the computer. The 
picture was on the monitor and the sound came through the speakers. 
That means, both the monitor and the speakers were giving the 
output at the same time! 
Moz: You are right.
Output
CONCEPTS
Moz disconnects the keyboard and asks Tejas to type his name on 
the keyboard.
Input
Output
Tejas: I don?t see my name on the monitor. The CPU is 
not able to receive the input as the keyboard is 
disconnected. So there is no output on the monitor.
Moz: Correct. Suppose an input or output device is not 
working, what should we do?
Tejas: Check if all the devices are connected properly 
to the CPU or not.
 
Moz: Good. So now you know that:
   Keyboard and mouse are input devices.
   Monitor, speakers and printer are output devices.
   Any device has to be connected to the CPU in order to 
         receive or send information.
   CPU controls all the connected input and output devices. 
Moz: What are the dos and don?ts when we use these 
devices?
Jyoti: Sit straight. Keep the correct distance from the 
monitor.
Moz: Yes, and there are some more exercises that we should 
do. We will learn about these tomorrow. 
Chin Chinaki...
After you have studied this lesson, 
you will be able to:
Give examples of input and output of 
a process.
Identify some input and output 
devices of a computer.
 
Describe the function of the CPU.
Learning Outcome
CONCEPTS
The CPU is neither an input nor an output device. It takes the 
information given by the input devices, does the work and sends the 
result to the output devices. This is called Processing.
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Tejas: When I draw using a mouse, the drawing actions are the input. 
When the computer prints the drawing, the printout is the output.
Moz: Correct. What did you use to give the command to print?
Tejas: The mouse. I clicked on the print icon.
Moz: The command given using the mouse is an input.  So the mouse 
is an input device.
Jyoti [holding a Marigold flower]: Moz, this flower 
from my garden is for you.
Tejas [holding a printout of a painting]: Moz, this 
painting from the computer is for you.
Moz: Thanks. A plant takes in water and 
gives flowers. Taking in is called Input.  Giving out 
is called Output. Water is the input and flowers 
are the output for the plant. Can you give an 
example of an input and an output for a computer?
In this lesson you will learn:
About Input and Output concepts.
Some examples of Input and Output devices.
Lesson2
Input and Output Devices
CONCEPTS
Input devices allow us to send information to the 
computer. Input to the computer is usually given by 
clicking the mouse or typing on the keyboard.  
Input 
Output 
Output devices allow us to receive information from the 
computer. Output from the computer may be printouts from the 
printer, sounds on the speaker, or images on the monitor.
Output
Moz: From which device did you get the 
output?
Jyoti: Printer! So the printer must be 
an output device.
Tejas: Whatever we type using the keyboard, appears on the 
monitor. So the keyboard is an input device and the 
monitor is an output device. 
Moz: Right, the commands you type are the input and 
what you see on the monitor is the output.
Jyoti: When we paint using the computer, the painting 
can be seen on the monitor. So the paint actions that we do 
using the mouse are the input. The painting shown on the monitor is 
the output.
Moz: Yes. The mouse pointer, words, numbers, painting, and 
everything that is seen on the monitor is the output.
Moz [plays a song on the computer]: Now tell 
me what is the input and output?
Tejas: The song that we hear is the output. 
Jyoti: We hear the songs from the speakers. 
So speakers are output devices.
Moz: Correct. What about the input? 
Jyoti: You clicked on the song icon using the 
mouse.This clicking is the input.
Tejas: So the mouse is the input device.
Jyoti: During the holidays, I saw a movie on the computer. The 
picture was on the monitor and the sound came through the speakers. 
That means, both the monitor and the speakers were giving the 
output at the same time! 
Moz: You are right.
Output
CONCEPTS
Moz disconnects the keyboard and asks Tejas to type his name on 
the keyboard.
Input
Output
Tejas: I don?t see my name on the monitor. The CPU is 
not able to receive the input as the keyboard is 
disconnected. So there is no output on the monitor.
Moz: Correct. Suppose an input or output device is not 
working, what should we do?
Tejas: Check if all the devices are connected properly 
to the CPU or not.
 
Moz: Good. So now you know that:
   Keyboard and mouse are input devices.
   Monitor, speakers and printer are output devices.
   Any device has to be connected to the CPU in order to 
         receive or send information.
   CPU controls all the connected input and output devices. 
Moz: What are the dos and don?ts when we use these 
devices?
Jyoti: Sit straight. Keep the correct distance from the 
monitor.
Moz: Yes, and there are some more exercises that we should 
do. We will learn about these tomorrow. 
Chin Chinaki...
After you have studied this lesson, 
you will be able to:
Give examples of input and output of 
a process.
Identify some input and output 
devices of a computer.
 
Describe the function of the CPU.
Learning Outcome
CONCEPTS
The CPU is neither an input nor an output device. It takes the 
information given by the input devices, does the work and sends the 
result to the output devices. This is called Processing.
1. Aaron wants to connect all the parts of the computer but
   does not know how. Please guide him.
2. Underline the correct answer:
a. Your eyes are input devices of your body.  
  True / False
b.The computer uses an output device to show us something. 
  True / False
c. We use input devices to tell the computer what to do. 
  True / False
Level II | Lesson 2
WORKSHEETS
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Tejas: When I draw using a mouse, the drawing actions are the input. 
When the computer prints the drawing, the printout is the output.
Moz: Correct. What did you use to give the command to print?
Tejas: The mouse. I clicked on the print icon.
Moz: The command given using the mouse is an input.  So the mouse 
is an input device.
Jyoti [holding a Marigold flower]: Moz, this flower 
from my garden is for you.
Tejas [holding a printout of a painting]: Moz, this 
painting from the computer is for you.
Moz: Thanks. A plant takes in water and 
gives flowers. Taking in is called Input.  Giving out 
is called Output. Water is the input and flowers 
are the output for the plant. Can you give an 
example of an input and an output for a computer?
In this lesson you will learn:
About Input and Output concepts.
Some examples of Input and Output devices.
Lesson2
Input and Output Devices
CONCEPTS
Input devices allow us to send information to the 
computer. Input to the computer is usually given by 
clicking the mouse or typing on the keyboard.  
Input 
Output 
Output devices allow us to receive information from the 
computer. Output from the computer may be printouts from the 
printer, sounds on the speaker, or images on the monitor.
Output
Moz: From which device did you get the 
output?
Jyoti: Printer! So the printer must be 
an output device.
Tejas: Whatever we type using the keyboard, appears on the 
monitor. So the keyboard is an input device and the 
monitor is an output device. 
Moz: Right, the commands you type are the input and 
what you see on the monitor is the output.
Jyoti: When we paint using the computer, the painting 
can be seen on the monitor. So the paint actions that we do 
using the mouse are the input. The painting shown on the monitor is 
the output.
Moz: Yes. The mouse pointer, words, numbers, painting, and 
everything that is seen on the monitor is the output.
Moz [plays a song on the computer]: Now tell 
me what is the input and output?
Tejas: The song that we hear is the output. 
Jyoti: We hear the songs from the speakers. 
So speakers are output devices.
Moz: Correct. What about the input? 
Jyoti: You clicked on the song icon using the 
mouse.This clicking is the input.
Tejas: So the mouse is the input device.
Jyoti: During the holidays, I saw a movie on the computer. The 
picture was on the monitor and the sound came through the speakers. 
That means, both the monitor and the speakers were giving the 
output at the same time! 
Moz: You are right.
Output
CONCEPTS
Moz disconnects the keyboard and asks Tejas to type his name on 
the keyboard.
Input
Output
Tejas: I don?t see my name on the monitor. The CPU is 
not able to receive the input as the keyboard is 
disconnected. So there is no output on the monitor.
Moz: Correct. Suppose an input or output device is not 
working, what should we do?
Tejas: Check if all the devices are connected properly 
to the CPU or not.
 
Moz: Good. So now you know that:
   Keyboard and mouse are input devices.
   Monitor, speakers and printer are output devices.
   Any device has to be connected to the CPU in order to 
         receive or send information.
   CPU controls all the connected input and output devices. 
Moz: What are the dos and don?ts when we use these 
devices?
Jyoti: Sit straight. Keep the correct distance from the 
monitor.
Moz: Yes, and there are some more exercises that we should 
do. We will learn about these tomorrow. 
Chin Chinaki...
After you have studied this lesson, 
you will be able to:
Give examples of input and output of 
a process.
Identify some input and output 
devices of a computer.
 
Describe the function of the CPU.
Learning Outcome
CONCEPTS
The CPU is neither an input nor an output device. It takes the 
information given by the input devices, does the work and sends the 
result to the output devices. This is called Processing.
1. Aaron wants to connect all the parts of the computer but
   does not know how. Please guide him.
2. Underline the correct answer:
a. Your eyes are input devices of your body.  
  True / False
b.The computer uses an output device to show us something. 
  True / False
c. We use input devices to tell the computer what to do. 
  True / False
Level II | Lesson 2
WORKSHEETS
3. Sonu and Monu, the two baby kangaroos are lost. Sonu can
    reach his mother following the path by hopping on the input
    devices of a computer. Monu can reach his mother by
    hopping on the output devices. Please help them to reach
    their mothers, by identifying the input and output devices.
(Input / Output Device) (Input / Output Device)
(Input / Output Device) (Input / Output Device)
(Input / Output Device) (Input / Output Device)
Level II | Lesson 2
WORKSHEETS