INTRODUCTION

INTRODUCTION

Computer? - Device which store data, process data, access data according to users need.

Computer = Hardware + Software

Hardware – Physical components of computers.

Software – Program used to control Hardware.

How Computer Works ?

Input Devices                                      Process Devices                                  Output Devices

Keyboard                                            SMPS                                                  Monitor

Mouse                                                 Mother Board                                     Printer

Scanner                                               Memory

Digital Camera                                    CPU

Note  – Output on monitor is called SOFT COPY.

               Output on paper is called HARD COPY.

SMPS (Switch Mode Power Supply)

-          It can called as a power house of computer.

-          It reduce the amount of voltage. (220VAC to 12VDC)

(AC = Alternate Current / DC = Direct Current)

Mother Board / Logic Board / System Board

-          Mother Board get the power supply from SMPS.

-          Other devices get the power supply from mother board.

-          Mother board content other devices.

CPU (Central Processing Unit)

-          Brain of the Computer

-          It Control all devices.

Ports and Connectors

VGA Port – 15 pin port arranged in 3 rows to connect monitor (CRT- Cathode Ray Tube Monitor)

15 Pin VGA Port

    

                      

DVI Port  -  24 pin port arranged in 3 rows to connect LCD monitors (LCD – liquid Crystal Display – Lab top Monitor)

24 Pin DVI Port

                    

	0 or 1 = bit  bit is smallest unit of information 8 bit = 1 Byte 1024 bytes = 1 Kilo Byte 1024 KB = 1 Mega Byte 1024 MB = 1 Giga Byte 1024 GB = 1 Tera Byte  view image

 

PS2/Port –

-          Used to connect PS/2 mouse.                                                

6 Pin PS/2 Port

                                                                                                       

Serial Port / COM Port  -                                                      

-          9 pin connector to connect serial mouse. view                              

-          Port which allow only one bit at a time.                                

-          Used to connect communication device.                               

(COM Port – Communication Port)

	9 Pin Serial Port

 

 

USB Port –