Different input and output devices

The most common ________ are the keyboard and the mouse. We can also interact with a computer by using a lightpen, a scanner, a trackball, a graphics tablet, a voice recognition device or a _________.

A keyboard is a set of keys on a terminal or computer, including the standard typewriter keys, _______ and several special keys.

A mouse allows you to control the ______ and move around the screen very quickly. As you move the _______ on your desk, the pointer on the ______ moves in the same direction.

A scanner ‘sees’ images and converts the _______or pictures into electronic codes that can be understood by the ______. With a flatbed colour scanner, the paper with the image is placed face down on a glass screen. Once the scanner is activated, it reads the image as a series of ____ and then generates the digitized image that is sent to the computer and stored as a file.

A digital camera takes photos electronically and converts them into digital data (_____made up of 1s and 0s).

A camcorder, or ______, records moving pictures and converts them into _____ that can be stored and edited by a computer with special video ______. They are also used to send live video images via the Internet. In this case they are called web cameras, or ______.

Displays, often called ______ or screens, are the most used _____ on a computer. They provide instant feedback by showing you text and graphic images as you work or play. Most desktop displays use LCD or CRT (Cathode Ray Tube) technology, while portable computers incorporate _____. Because of their slimmer design and lower energy consumption, LCD monitors (also called _____ displays) are replacing CRTs. An LCD is made of two glass plates with a _____ material between them. Active-matrix LCDs use TFT (thin film transistor) technology.

Listening

Exercise 22. (Track 1.3). A) You are going to listen to two people making enquiries in a computer shop. The shop assistant is telling them about the two models below. Listen and fill in the missing information.

	iMac Processor speed 2.33 GHz RAM ____________ Hard drive capacity ______________ DVD drive included? Yes Operating system _______________ Internet software Yes Price ______________
	MacBook Processor speed _________________ RAM ____________ Hard drive capacity ______________ DVD drive included? ____________ Operating system _______________ Internet software Yes Price £1,029

B) Listen again and answer the following questions.

1. What does Core Duo technology actually mean?

2. What is the iMac more suitable for?

3. What is the MacBook more practical for?

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