Objectives :
What you going to learn in this lesson :
1.1Overview of Computer
1.2 Components of Graphical User Interface
1.3 Desktop Icon and Components
1.4 Configuring Desktop Environment
We can define computer in several ways lets see few web definitions below.
- An electronic device for storing and processing data, typically in binary form, according to instructions given to it in a variable program
- A computer is a programmable machine that receives input, stores and manipulates data information, and provides output in a useful format. ( http://en.wikipedia.org/wiki/Computer )
Use Of Computer:
- Solve complicated mathematical problems.
- Process large amount of information without errors.
- Automate day to day transactions. Reduce number of people required to perform particular task.
- E-mail to people across the world.
- Play games.
Components of Computer:
- Monitor
- Keyboard
- System Unit
- Printer
- Mouse
Hardware Components of Computer
- Input Devices
- Output Devices
- Processing Devices
- Storage Devices
1.Input Devices
Input Devices enables a user to enter data into computer.
Ex:
- Keyboard
- Mouse
- Scanner
- Web Cam
- Digital Camera
- Joystick
- Touch Pad
- Light Pen
- Microphone
2. Out Put Devices :
- Visual Display Unit ( VDU )
- Printer
- Plotters ( http://en.wikipedia.org/wiki/Plotter )
- Speakers
- Projectors
3. Processing Device:
Data that is input to computer is processed with the help of a processing device called the System Unit.
Component of the System Unit :
- Central Processing Unit ( CPU )
- Memory
Central Processing Unit : CPU also called processor. This is the brain of a computer system. CPU Controls the operations of a computer system and executes all introductions specified by a user.
CPU Comprises :
- The Arithmetic and Logic Unit ( ALU ) - Performs all of the calculations.
- The Control Unit - Controls the flow of data around the computer by sending out control signals.
- Registers - Used to store data.
