Upload
abel-hawkins
View
224
Download
4
Embed Size (px)
Citation preview
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