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Subject Name: Computer Maintenance And Trouble Shooting Unit No: 01 Subject Code: 4360701


Unit-1 Introduction to PC Hardware
 Computer, Hardware ,Software
Computer: A computer is an electronic device that:
 accepts input
 processes data
 stores data
 produces output
Hardware:
 Computer Hardware is the physical part of the computer system, the machinery and equipment.
 Parts of the computer “you can see”

Firmware :
 Firmware is low-level software often stored on electrically programmable mernory
devices.
 Firmware is given its name because it is treated like hardware and run by other software
programs.
 Firmware is a combination of software and hardware. Computer chips that have data or
programs recorded on them are firmware.
 These chips commonly include the following:
 ROMs(read-only memory)
 PROMs(programmable read-only memory)
 EPROMs(erasable programmable read-only memory)

 Examples of Computer Hardware




Software:
Computer Software are programs that tell the computer what to do.

Examples :
 Microsoft Word-word processing program
 Microsoft PowerPoint-presentation program

Prepared By: Department of Electrical Engineering Page 1

,Subject Name: Computer Maintenance And Trouble Shooting Unit No: 01 Subject Code: 4360701


 Microsoft Excel-work book program used to track, calculate, and analyze numeric data

 BASIC PART OF COMPUTER SYSTEM
 Input Devices: devices that input information into the computer  such as a keyboard, mouse,
scanner, and digital camera.




 Output Devices: devices that output information from the computer such as a printer and monitor.




 CPU (Central Processing Unit) also called the Microprocessor or “The Brain” of the Computer.
 Processor speed: The speed at which a microprocessor executes instructions. This is usually
measured in megahertz (MHz).
 Brands of Processors include:
 Pentium
 Celeron
 MAC
 AMD
 Cyrix




Prepared By: Department of Electrical Engineering Page 2

, Subject Name: Computer Maintenance And Trouble Shooting Unit No: 01 Subject Code: 4360701


 Types of Computer System OR Classification of Computer.

1) Personal Computer (Micro Computer):-
 a small computer designed for use by a single user at a time.
 A PC or microcomputer uses a single chip (microprocessor) for its central processing unit
(CPU).
 “Microcomputer” is now primarily used to mean a PC, but it can refer to any kind of small
computer, such as a desktop computer, laptop computer, tablet, smartphone, or wearable.
 PC has low cost and smaller size.
 It is useful for individuals without intermediate compter operator.
 The most common operating system such as Microsoft Window, Mac OS , UNIX, LINUX
etc are used in PC.
 It can be capable to connect with other PC on LAN.
 Types of personal computers
I. Desktop computer – a personal computer that is designed to stay at one location and fits on
or under a desk. It typically has a monitor, keyboard, mouse, and a tower (system unit).




II. Laptop computer (or notebook) – A portable personal computer that is small enough to rest
on the user’s lap and can be powered by a battery. It includes a flip down screen and a
keyboard with a touchpad.




III. Tablet – A wireless touch screen PC that is slightly smaller and weighs less than the average
laptop.




Prepared By: Department of Electrical Engineering Page 3