A computer is an electronic device used to process data , converting data into information that is useful to

people.

A complete computer system includes four distinct parts:

Hard wear

Soft wear

Data

User

The computer system Defined: Hard wearTypes of Hard wear: :

*Processor

*Memory

*Input and Output (I/O devices )

*Storage devices

What is input

Data or instruction entered into memory of computer

Input device

Is any hard wear component used to enter data.

What are the two types of input

* Data: Unprocessed text , number , images and video

* Instructions: 1 /programs

2 /commands3 /user responses

How is the keyboard divided

•Typing area

•Numeric keypad

•Function keys , special keys

What is a mouse

Pointing device that fits under palm of hand

Pointing device / controls movement of pointer , else called mouse pointer

Mechanical mouse

Has rubber or metal ball on underside

What are common mouse operation

*Point

*Click / double click / triple click

*Drag / right drag

*Rotate wheel / press wheel button

What is a scanner

Light-sensing device that reads printed text and graphics

Used for image processing , converting paper document into electronic images