Based on shapes and size, computers are classified into many types. Computers can be as small as your palm, or large enough to occupy several rooms of building. Did you the smallest computer of the world? The smallest computer is the size of rice. This smallest computer is used to analyze the data and can perform some other basic tasks.
Desktop Computer: The first personal computer was invented in 1980 by IBM – International Business Machine. The desktop computer have many devices like Input device, Output device, Storing device and other motherboard components.
Laptop: This are portable computers that are integrated with a display screen, keyboard, processor, memory and trackball. A user can carry laptop with him anywhere. Laptop doesn’t required electricity to run instead laptops are run on a rechargeable battery. With like portable, small in size, light weight, laptops are more popular than computers or desktop computer and also laptops are more expensive than computers.
iPad: In April 201, Apple designed and developed iPad tablet computer which are more lighter than laptops. The user interface of the iPad is very similar to iPod and iPhone. Behind the designed of iPad, Apple keep two things in mind that people need big screen than mobile phone and lighter than laptop. That is why iPad are lighter than laptops and the screen size of iPad is 9.7 inch.
PDA – Personal Digital Assistant: This devices is designed to use for a personal organizer with communication capabilities. The device is light in weight and can be operate with one hand. It is also called as hand-held computer. A typical PDA has no keyboard and it has a LCD screen as output device.. It relies on special hardware and touch pen based computer software to enable the recognition of hand written input written on the LCD screen.
Computer Hardware
- Mouse
- Keyboard
- Monitor
- Speaker
- Scanner
- Printer
System Unit: System Unit is also called as Case or Computer Case. It is rectangular in shape and the most essential part of the computer system. There are two part of the system unit: Front Side and Rear side. Front side contains different buttons and display LED such as Power switch button, Reset button, DVD/CD Combo Drive. The read side of the system unit contains various ports such as Serial port, parallel port, USB ports. Rear side also contain Power switch with power connector/port, cooling fan and SMPS cooling fan.
Inside System Unit
- Motherboard
- Basic Input Output System
- Memory (Primary and Secondary)
- Display Cards (Video and Sound)
- SMPS
