Training Computer:Types of computers

Types of computers

Range of computers in size and capacity. At one end of the scale are supercomputers, very large computers with thousands of connected microprocessors that run highly complex calculations. At the other end are tiny computers embedded in cars, televisions, stereos, calculators and appliances. These computers are designed to perform a limited number of tasks.

The personal computer, or PC, is designed to be used by a person at a time. This section describes the various types of personal computers: desktops, laptops, handheld computers and Tablet PCs.

Desktops
Desktop computers are designed for use in a desk or table. They are generally larger and more powerful than other types of personal computers. Desktops are made of separate components. The main component, called the system unit, is generally rectangular case that sits on or under a desk. Other factors, such as the monitor, mouse and keyboard, connect to the unit.

Laptops
The laptops are lightweight laptop with a thin screen. They are often called notebook computers because of their small size. Laptop can run on batteries, you can take anywhere. Unlike desktops, laptops combine the processor, screen, keyboard and in one case. The screen folds down on the keyboard when not in use.

Handhelds
Handheld computers, also known as personal digital assistants (PDAs) are powered by the battery of computers small enough to carry virtually anywhere. Although not as powerful as desktops or laptops, handhelds are useful for planning appointments, store addresses and phone numbers, and games. Some have more advanced capabilities, such as making telephone calls or Internet access. Instead of keyboards, handhelds have touch screens that you use with your finger or stylus (pen-shaped tool score).

Tablet PC
Tablet PCs are mobile PCs that combine features of laptops and handheld computers. Like laptops, they are powerful and have a high-screen. Like handhelds, they allow you to write notes or draw pictures on the screen, usually with a pen tablet instead of a stylus. They can also convert your handwriting into typed text. Some Tablet PCs are "convertible" with a screen that swivels and unfolds to reveal a keyboard underneath.