Textbook: Computer Start Up and Shut Down | Computer Science for Class 2 PDF Download

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Lesson8
Computer Start Up and Shut Down
Moz: Locate the Power button on the CPU and press it lightly. 
Jyoti: The small light on the CPU is on and it is blinking! 
Moz: The light indicates that the computer is switched on. 
Jyoti: Moz, the computers are switched off when not in use to save 
electricity. Can you please start the computer for us? 
Moz: Ok. First let us check if the power supply switch is on.
In this lesson you will learn:
About Start Up and Shut Down of a computer. 
CONCEPTS
Switching on a computer
Computer is a machine that works on electricity. Parts of the 
computer like the CPU, monitor, mouse and keyboard require 
electricity. The 'Power' button on the CPU is used to switch 
on the computer. 
Page 2


m A
i
Lesson8
Computer Start Up and Shut Down
Moz: Locate the Power button on the CPU and press it lightly. 
Jyoti: The small light on the CPU is on and it is blinking! 
Moz: The light indicates that the computer is switched on. 
Jyoti: Moz, the computers are switched off when not in use to save 
electricity. Can you please start the computer for us? 
Moz: Ok. First let us check if the power supply switch is on.
In this lesson you will learn:
About Start Up and Shut Down of a computer. 
CONCEPTS
Switching on a computer
Computer is a machine that works on electricity. Parts of the 
computer like the CPU, monitor, mouse and keyboard require 
electricity. The 'Power' button on the CPU is used to switch 
on the computer. 
Jyoti: There is nothing on the screen as the monitor is off. 
Moz: Yes. Press the button on the monitor to switch it on. This button 
is called a toggle switch. To switch off the monitor you press it again.
Tejas: Why is it taking so long to show the desktop?
Moz: It is getting everything ready for your use. 
This is called Start Up or Booting.
Jyoti: The monitor also has a small light indicating that it is on. 
Moz: Correct. Most of the monitors have an on/off indicator light.
Moz: Similarly a computer needs to check if you have permission to 
use the computer. The computer compares the username you 
enter, with the names of the users that have been stored 
on it.
 Moz creates usernames and passwords for Tejas and 
Jyoti.
Jyoti: I have entered jyoti as the username, but now it is 
asking for a password. What is it?
Tejas: Where is the desktop with icons? What is this username being 
shown on the monitor?
Moz: Ok. First answer a few questions. What do you do when someone 
rings the bell at your home?
Jyoti: We open the door and check who it is. We let them into the 
house only if we know the person. 
CONCEPTS
Start Up is the sequence of actions done by the computer 
when it is switched on. This is also called Booting.
Page 3


m A
i
Lesson8
Computer Start Up and Shut Down
Moz: Locate the Power button on the CPU and press it lightly. 
Jyoti: The small light on the CPU is on and it is blinking! 
Moz: The light indicates that the computer is switched on. 
Jyoti: Moz, the computers are switched off when not in use to save 
electricity. Can you please start the computer for us? 
Moz: Ok. First let us check if the power supply switch is on.
In this lesson you will learn:
About Start Up and Shut Down of a computer. 
CONCEPTS
Switching on a computer
Computer is a machine that works on electricity. Parts of the 
computer like the CPU, monitor, mouse and keyboard require 
electricity. The 'Power' button on the CPU is used to switch 
on the computer. 
Jyoti: There is nothing on the screen as the monitor is off. 
Moz: Yes. Press the button on the monitor to switch it on. This button 
is called a toggle switch. To switch off the monitor you press it again.
Tejas: Why is it taking so long to show the desktop?
Moz: It is getting everything ready for your use. 
This is called Start Up or Booting.
Jyoti: The monitor also has a small light indicating that it is on. 
Moz: Correct. Most of the monitors have an on/off indicator light.
Moz: Similarly a computer needs to check if you have permission to 
use the computer. The computer compares the username you 
enter, with the names of the users that have been stored 
on it.
 Moz creates usernames and passwords for Tejas and 
Jyoti.
Jyoti: I have entered jyoti as the username, but now it is 
asking for a password. What is it?
Tejas: Where is the desktop with icons? What is this username being 
shown on the monitor?
Moz: Ok. First answer a few questions. What do you do when someone 
rings the bell at your home?
Jyoti: We open the door and check who it is. We let them into the 
house only if we know the person. 
CONCEPTS
Start Up is the sequence of actions done by the computer 
when it is switched on. This is also called Booting.
Moz: Correct. The username is also called login. Once you enter the 
username and password, you will be logged into the computer.
Log Out
Tejas: Now that I have my own username and password, will Jyoti be 
able to see my files when she logs in? 
Moz: No, each user sees only their own desktop and files created or 
saved by them. 
Jyoti: I can now have a different wallpaper on my desktop. 
Tejas: What do I do when I finish using the computer? 
Moz: You have to Log Out of the computer using the 
logout icon. It is just like locking the door of your 
house when you go out.
Login and password
 
      When a computer is used by more than one person, 
      each user is given a username and password to access it.
      If the username and password are not typed correctly,
      the dialog box prompts you to enter them again.
CONCEPTS
How to start using the computer:
1. Enter the correct username.
2. Enter the password.
Moz: Each username has a key which is called a password. The 
password is a secret word, letters or numbers known only to you and 
the computer. You will be able to use the computer only after 
entering the correct username and password.
Jyoti: All students have their own username and password! 
SKILLS
Page 4


m A
i
Lesson8
Computer Start Up and Shut Down
Moz: Locate the Power button on the CPU and press it lightly. 
Jyoti: The small light on the CPU is on and it is blinking! 
Moz: The light indicates that the computer is switched on. 
Jyoti: Moz, the computers are switched off when not in use to save 
electricity. Can you please start the computer for us? 
Moz: Ok. First let us check if the power supply switch is on.
In this lesson you will learn:
About Start Up and Shut Down of a computer. 
CONCEPTS
Switching on a computer
Computer is a machine that works on electricity. Parts of the 
computer like the CPU, monitor, mouse and keyboard require 
electricity. The 'Power' button on the CPU is used to switch 
on the computer. 
Jyoti: There is nothing on the screen as the monitor is off. 
Moz: Yes. Press the button on the monitor to switch it on. This button 
is called a toggle switch. To switch off the monitor you press it again.
Tejas: Why is it taking so long to show the desktop?
Moz: It is getting everything ready for your use. 
This is called Start Up or Booting.
Jyoti: The monitor also has a small light indicating that it is on. 
Moz: Correct. Most of the monitors have an on/off indicator light.
Moz: Similarly a computer needs to check if you have permission to 
use the computer. The computer compares the username you 
enter, with the names of the users that have been stored 
on it.
 Moz creates usernames and passwords for Tejas and 
Jyoti.
Jyoti: I have entered jyoti as the username, but now it is 
asking for a password. What is it?
Tejas: Where is the desktop with icons? What is this username being 
shown on the monitor?
Moz: Ok. First answer a few questions. What do you do when someone 
rings the bell at your home?
Jyoti: We open the door and check who it is. We let them into the 
house only if we know the person. 
CONCEPTS
Start Up is the sequence of actions done by the computer 
when it is switched on. This is also called Booting.
Moz: Correct. The username is also called login. Once you enter the 
username and password, you will be logged into the computer.
Log Out
Tejas: Now that I have my own username and password, will Jyoti be 
able to see my files when she logs in? 
Moz: No, each user sees only their own desktop and files created or 
saved by them. 
Jyoti: I can now have a different wallpaper on my desktop. 
Tejas: What do I do when I finish using the computer? 
Moz: You have to Log Out of the computer using the 
logout icon. It is just like locking the door of your 
house when you go out.
Login and password
 
      When a computer is used by more than one person, 
      each user is given a username and password to access it.
      If the username and password are not typed correctly,
      the dialog box prompts you to enter them again.
CONCEPTS
How to start using the computer:
1. Enter the correct username.
2. Enter the password.
Moz: Each username has a key which is called a password. The 
password is a secret word, letters or numbers known only to you and 
the computer. You will be able to use the computer only after 
entering the correct username and password.
Jyoti: All students have their own username and password! 
SKILLS
Moz switches off the power supply after the shutdown procedure is 
completed.
Jyoti: The light on the CPU is off now.  Let us switch off the 
monitor too.
Jyoti: If we have finished using the computer, should we not shut it 
down to  save electricity?
Tejas: Once I log out, can others login to the same computer? 
Moz: Yes. Anyone who has a username on a computer will be able to 
use that computer.
Moz: Yes. Select the Shut Down option near the logout icon to 
turn off the computer. Please note that it takes some time to 
shut down. This is because the computer is closing the 
activities that it started at the time of booting. We should 
not switch off the power till this is complete.
Shut Down
Log Out
Log out is the action of closing one’s access to the computer.
CONCEPTS
Shut Down
 Shut down is the action of closing all the activities and turning  
 the computer off. CONCEPTS
Page 5


m A
i
Lesson8
Computer Start Up and Shut Down
Moz: Locate the Power button on the CPU and press it lightly. 
Jyoti: The small light on the CPU is on and it is blinking! 
Moz: The light indicates that the computer is switched on. 
Jyoti: Moz, the computers are switched off when not in use to save 
electricity. Can you please start the computer for us? 
Moz: Ok. First let us check if the power supply switch is on.
In this lesson you will learn:
About Start Up and Shut Down of a computer. 
CONCEPTS
Switching on a computer
Computer is a machine that works on electricity. Parts of the 
computer like the CPU, monitor, mouse and keyboard require 
electricity. The 'Power' button on the CPU is used to switch 
on the computer. 
Jyoti: There is nothing on the screen as the monitor is off. 
Moz: Yes. Press the button on the monitor to switch it on. This button 
is called a toggle switch. To switch off the monitor you press it again.
Tejas: Why is it taking so long to show the desktop?
Moz: It is getting everything ready for your use. 
This is called Start Up or Booting.
Jyoti: The monitor also has a small light indicating that it is on. 
Moz: Correct. Most of the monitors have an on/off indicator light.
Moz: Similarly a computer needs to check if you have permission to 
use the computer. The computer compares the username you 
enter, with the names of the users that have been stored 
on it.
 Moz creates usernames and passwords for Tejas and 
Jyoti.
Jyoti: I have entered jyoti as the username, but now it is 
asking for a password. What is it?
Tejas: Where is the desktop with icons? What is this username being 
shown on the monitor?
Moz: Ok. First answer a few questions. What do you do when someone 
rings the bell at your home?
Jyoti: We open the door and check who it is. We let them into the 
house only if we know the person. 
CONCEPTS
Start Up is the sequence of actions done by the computer 
when it is switched on. This is also called Booting.
Moz: Correct. The username is also called login. Once you enter the 
username and password, you will be logged into the computer.
Log Out
Tejas: Now that I have my own username and password, will Jyoti be 
able to see my files when she logs in? 
Moz: No, each user sees only their own desktop and files created or 
saved by them. 
Jyoti: I can now have a different wallpaper on my desktop. 
Tejas: What do I do when I finish using the computer? 
Moz: You have to Log Out of the computer using the 
logout icon. It is just like locking the door of your 
house when you go out.
Login and password
 
      When a computer is used by more than one person, 
      each user is given a username and password to access it.
      If the username and password are not typed correctly,
      the dialog box prompts you to enter them again.
CONCEPTS
How to start using the computer:
1. Enter the correct username.
2. Enter the password.
Moz: Each username has a key which is called a password. The 
password is a secret word, letters or numbers known only to you and 
the computer. You will be able to use the computer only after 
entering the correct username and password.
Jyoti: All students have their own username and password! 
SKILLS
Moz switches off the power supply after the shutdown procedure is 
completed.
Jyoti: The light on the CPU is off now.  Let us switch off the 
monitor too.
Jyoti: If we have finished using the computer, should we not shut it 
down to  save electricity?
Tejas: Once I log out, can others login to the same computer? 
Moz: Yes. Anyone who has a username on a computer will be able to 
use that computer.
Moz: Yes. Select the Shut Down option near the logout icon to 
turn off the computer. Please note that it takes some time to 
shut down. This is because the computer is closing the 
activities that it started at the time of booting. We should 
not switch off the power till this is complete.
Shut Down
Log Out
Log out is the action of closing one’s access to the computer.
CONCEPTS
Shut Down
 Shut down is the action of closing all the activities and turning  
 the computer off. CONCEPTS
After you have studied this lesson, 
you will be able to:
Start the computer, login, log off, 
and shut down the computer.
Explain how different users can 
share the same computer.
Explain the difference between 
log out and shut down.
Learning Outcome
How to Shut Down:
To shut down a computer, select the Shut Down option 
from the dialog box. The electric supply to the computer 
should be switched off only after the lights on the 
computer go off.
Jyoti: What should we do now?
Moz: Revise what you have learnt this year in the 
computer class and work on the projects.
Tejas: Moz, it was fun learning computers with 
you. Where do you plan to go on your vacation? 
Moz: Timbaktu. Find out where it is. 
See you next year. Chin Chinaki...
SKILLS