PARTS OF A COMPUTER

INTRODUCTION

The basic parts of a desktop computer are the computer case, monitor,keyboard, mouse, and power cord. Each part plays an important role whenever you use a computer.

THE COMPUTER CASING

The computer case is the metal and plastic box that contains the main componentsof the computer. It houses the motherboard, central processing unit (CPU), power supply, and more.

Computer cases come in different shapes and sizes. A desktop case lies flat on a desk, and the monitor usually sits on top of it. A tower case is tall and sits next to the monitor or on the floor. The front of the case usually has an on/off switch and one or more optical drives.

The casing to the computer's motherboard

Most of the personal computers you can purchase today include tower cases rather than desktop cases; however, some computers are being made with all of the internal components built into the monitor, which eliminates the need for a tower.

An example of a personal computer (Laptop)

THE MONITOR

The monitor works with a video card, located inside the computer case, to display images and text on the screen. Newer monitors usually have LCD (liquid crystal display) or LED (light-emitting diode) displays. These can be made very thin, and they are often called flat-panel displays. Older monitors use CRT (cathode ray tube) displays. CRT monitors are much larger and heavier, and they take up more desk space.

Most monitors have control buttons that allow you to change your monitor's display settings, and some monitors also have built-in speakers.

LED displays are actually LCDs that are backlit with light-emitting diodes. This allows for greater contrast than a traditional LCD.

A CRT computer screen

An LCD computer screen

THE POWER CORD

The power cord is the link between the power outlet and the power supply unit in the computer casing. If the power cord is not plugged in, the computer will not power on. To protect your computer from voltage spikes, you can plug the power cord in to a surge protector. You can also use an uninterruptable power supply (UPS), which acts as a surge protector and provides temporary power if there is a blackout.

The Computer power cord

THE COMPUTER KEYBOARD

The keyboard is one of the primary ways we communicate with the computer and enter data. There are many different types of computer keyboards, including wired, wireless, ergonomic, and multimedia. Although there may be differences in the location of some keys or features, keyboards are very similar and allow you to accomplish basically the same tasks.

The computer keyboard

THE COMPUTER MOUSE

The mouse is a peripheral that is known as a pointing device. It lets you point to objects on the screen, click on them, and move them.

There are two main types of mice: optical and mechanical. The optical mouse uses an electronic eye to detect movement and is easier to clean. The mechanical mouse uses a rolling ball to detect movement. Generally, a mechanical mouse is less expensive, although it may require regular cleaning to keep it working properly.

Traditionally, a mouse connects to the computer using a USB or PS/2connection. However, you can also buy a wireless mouse, which can reduce clutter on your desktop.

A wired computer mouse

ALTERNATIVES TO THE MOUSE

• Trackball: A trackball has a ball on top that can rotate freely. Instead of moving the device like a mouse, you can roll the ball with your fingers to move the pointer. Some mobile devices have miniature trackballs that can be controlled with your thumb.
• Touchpad: A touchpad—also called a trackpad—is a touch-sensitive pad that lets you control the pointer by making a drawing motion with your finger. Touchpads are common on laptop computers.