Introduction to Computer (CLASS 3)
1) What is a computer?
A computer is an electronic machine which can do various jobs.
2) 2) What are
the characteristics of a computer?
- 1. Computer can work very fast. It can do calculations within seconds.
- 2. Computer gives accurate result. It does not make mistakes.
- 3. Computer can do millions of jobs without getting tired.
- 4. Computer can store large amount of information.
3)
3) What are
the parts of a computer?
- 1. Monitor: A monitor looks like a TV which displays images and text on the computer screen.
- 2. Mouse: It is used to select items, draw pictures and move cursor.
- 3. CPU: It is the brain of the computer. It gets data from the user processes it and gives the result.
- 4. Keyboard: It is used to type letters, numbers and symbols.
- 5. Printer: It is used to take printout on the paper.
- 6. Speaker: It is used to listen music and hear audio output.
4) To start a computer
1. Plug in your computer and all devices attached.
2. Switch On the Switch Board Switch.
3. Press power button of your CPU then computer will
be boot up.
5) To Shut down a computer
1. Click on the start button.
2. Then in the lower right corner of the start button
click on the shutdown option.
3. Then click on shutdown button.
6) Name some places where the computers
are used.
Schools use computers to teach lessons and prepare results.
Hospitals and banks
use computers to keep records.
7) Who is called the "Father of Computers"?
Charles Babbage.
Some of important
keys on Keyboard
1. Alphabetical Keys: A, B, C………………………………Z are
alphabets keys. There are 26 alphabet keys on the keyboard.
2. Numerical Keys: 0,1, 2………………………9 are
numeric keys. There are 10 numeric keys on the keyboard.
3. Special Keys: There are various
special keys
·
Caps Lock:
This key is used whenever we want to type letter in a capital. To use this key press
it once. If the light is on it means the Caps Lock is active. If we want to
write in small case then press this button again.
·
Enter Key:
This key is used to finish a line and move to a next new line on the page.
·
Shift Key:
Shift key is present on both sides of the keyboard This key is used to type capital letters
and other upper characters on a keyboard.
· Space Bar: This key is used to insert the space between two words.
It is the longest
key on the keyboard.
·
Backspace:
It is used to delete any character before the current position of the cursor.
·
Arrow Keys:
It is used to move the cursor position in all directions (left, right, up and down)
in the page.
Fun with Paintbrush
1.What is Paintbrush (MS Paint)?
Paintbrush or
MS Paint is a simple drawing program used to create and color pictures on a
computer.
2. MS Paint Tools:
·
The Pencil tool is used
for freehand drawing.
·
The Eraser tool is used to
remove parts of a drawing.
·
The Fill with Color tool
helps to fill an area with a selected color.
·
Brush Tool is used for
painting with different brush shapes and sizes.
·
Line Tool is used to draw
straight line
·
Shapes Tool provides
ready-made shapes like rectangles, circles, triangles, and arrows.
·
To draw a perfect circle,
we use the Oval tool while holding the Shift key.
3. Color Palette in MS Paint
The Color Palette in MS Paint allows users to choose and apply different colors to their drawings.
MS Office
1.
Microsoft Office is a
software which was developed by Microsoft in 1988.It has various applications.
2.
Main
applications are
·
Microsoft Word- It
is used to type letters, numbers, and notes,
·
Microsoft PowerPoint-
It is used to make slideshows with pictures, text,
and animations.
· MS Excel is used to make tables, timetables and create charts.
Keyboard Shortcuts
- Ctrl + N → Open a new document
- Ctrl + C → Copy the text
- Ctrl + V → Paste the text
- Ctrl + X → Cut the text
- Ctrl + Z → Undo (Go back one step)
- Ctrl + Y → Redo (Bring back)
- Ctrl + S → Save your work
- Ctrl + P → Print a document
- Ctrl + A → Select all text or pictures
- Ctrl + B → Make text bold
- Ctrl + I → Make text italic
- Ctrl + U → Underline text
Basic Computer Full forms
- CPU – Central Processing Unit (Brain of the Computer)
- CD -Compact Disc (Storage Device)
- DVD -Digital Video Disc (Storage Device)
- HDD – Hard Disk Drive (Stores data)
- WWW – World Wide Web (A collection of websites)
- Wi-Fi – Wireless Fidelity (Wireless internet connection)
- PC – Personal Computer (A computer used at home or school)
- OS – Operating System (Manages the computer)
- IT – Information Technology (Using computers to store and share information)
- AI – Artificial Intelligence (Smart computers that think like humans)
