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2. Definition of Computer
 Computer is an electronic
machine which accepts data from
us as an input, stores in memory
and process it and finally give the
result as an output.
 It is a device which is used to do
your work easier and faster.

3. Input & Output Devices
Input Devices Output Devices
Input devices are those
devices which are used to give
some input or enter any data
in your system. For example:
Keyboard, Mouse, Scanner
etc.
Output devices are those
devices which are used to
take the results from your
computer. For example:
Monitor, Printer, Speaker etc.

4. CPU
 CPU stands for Central Processing
Unit.
 CPU is the main part of our system as
it is also called the brain of computer.
 CPU store and process the data
entered by the user and send it to
output device to display that data to
user.

5. Hard Disk
 Hard disk is the storage device that is used in the
computer.
 It is a portable device. It can be removed from and
fixed again in computer.

6. RAM & ROM
RAM ROM
o RAM stands for Read Access
Memory.
o RAM is volatile and is erased
when the computer is switched
off.
o RAM is used for both read and
write
o ROM stands for Read Only
Memory.
o ROM is non-volatile and
generally cannot be written to.
o ROM is used only for reading.

7. SMPS
 SMPS stands for Switched Mode
Power Supply.
 It is used to switch the Alternating
Current(AC) voltage into Direct
current (DC) voltage which is
required for our computer systems
to work.
 It is placed inside the C.P.U of our
computer

8. Keyboard
 Keyboard is an Input device.
 It is used to give some input to your computer by
typing keys what we want to enter and store in
computer.

9. Mouse
 Mouse is also an Input device.
 It has two main buttons on it
which is called Primary and
Secondary button(also called
left click button and right click
button and one ball in middle
which is used for scrolling on
screen.
 It used sensor to detect the
location on screen.

10. Printer
 Printer is an Output device.
 It is used for printing the
documents from computer on
paper as a hardcopy.
 There are different types of
printer available.
 It uses ink for printing on
paper.

11. MS Office
 MS Office stands for Microsoft Office developed by
Microsoft Corporation.
 It is the suite of products that includes Microsoft
Word, Excel, Access, Publisher, PowerPoint and
Outlook.
 Each program servers a different purpose.

12. MS Word
 MS Word is an application of MS Office.
 It is used for the documentation work i.e. to store
the data in form of document. For example:-
Resumes, novels and Files etc.
 Word can include photos, charts and graphs,
tables etc.

14. MS Excel
 MS Excel is an another application of MS Office.
 It is a spreadsheet that has rows and columns to
store data or record and also to organize data
manipulations like arithmetic operations.
 It is commonly used for record handling of
schools, colleges, companies etc.

16. MS PowerPoint
 MS PowerPoint is also an application of MS
Office.
 It uses a graphical approach to presentations in
the form of slide shows.
 This program is widely used in business and
classrooms.

18. Contact Us
#15, DAYAL BAGH,
NEAR PANCHMUKHI HANUMAN MANDIR,
AMBALA CANTT-133001 (HARYANA)
EMAIL: INFO.JATINBATRA@GMAIL.COM
PH. NO: 9729666670, 4000670
WEBSITE: WWW.BATRACOMPUTERCENTRE.COM
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