Computer Course For beginners . Duration : 2 Weeks Classes Per Week : 3. Lecture # 1 Introduction To Computers & Their Components. What is a computer ?. A computer is an electronic machine used to perform different tasks for e.g.: for gaming ,
Duration : 2 Weeks
Classes Per Week : 3
A computer is an electronic machine used to
perform different tasks for e.g.: for gaming ,
listening songs , watching movies , chatting with
Friends , doing some office work (like making a
Presentation) and so on.
A computer works by taking commands given
by us or by a device present inside it and then
gives us the result .
We give commands to a computer by using
Some electronic devices like : A mouse ,
Keyboard , joystick e.t.c.
A computer has following major components :
A CPU is a combination of different components
or parts responsible for performing different
The output devices like monitor ,LCD’s
Connected to a CPU are used to show us the
results generated by the CPU.
A CPU has : -
All these parts are present on motherboard an
electrical circuit holding them together.
An input/output port is a point present normally
on back of cpu for connecting input and output
devices to it .
A memory is a place where CPU stores
information either temporarily or permanently .
A processor is part of CPU responsible for
performing all the operations on commands
given by us through input devices.
There are two main types of memory :
On a CPU the temporary memory is RAM
(Random Access Memory ) and Cache Memory.
On CPU the permanent memory is ROM(Read
Only Memory ) and Hard Disk.
Speed of a processor is measured in Hz(hertz) .
For e.g. we say Processor A is 3.20Ghz(Giga
hertz) and Processor B is 2.00Ghz
The size of memory is measured in bytes for e.g.
we say processor A has 2mb of RAM processor b
has 7Gb of RAM.
We will select a CPU having greater
memory(both RAM, Cache Memory and Hard
disk) and a processor of higher speed
A software is like soul inside a cpu without it we
cannot use it for performing different tasks. In
reality they are a line of statements telling the
computer what to do and how to do .
Different software's are used for different
purposes like for playing songs and videos we
use windows media player and so on.
A software can be installed from a usb drive,
cd/dvd/blue ray discs and from any website over
An operating system provides an interface to a
user so that he/she can use computer resources
like storage(for storing data) ,speakers(for
listening songs) and other different software's
like for playing games ,watching videos e.t.c.