плз Computer system

A computer system consists of two major elements: hardware and software. Computer hardware is the collection of all the parts you can physically touch. Computer software on the other hand is not something you can touch. Software is a set of instructions for a computer to perform specific operations. You need both hardware and software for a computer system to work.

It is useful to distinguish between two different types of computers: 1 computers and 2 computers. A desktop computer consists of a computer case and a separate monitor, keyboard and mouse. As the name suggests this type of computer is typically placed on a desk and is not very portable. A laptop computer has the same components but integrated into a single portable unit. While these two types of computers look quite different, they have the same general hardware components.

Let's start with the 3 . This is the metal enclosure that contains many of the other hardware components. It comes in various shapes and sizes but a typical tower model is between 15 to 25 inches high. The computer case contains a 4 ___ to convert general-purpose electricity to direct current. The most critical component is the 5 , a plastic board on which several essential components are mounted. This includes the 6 or CPU, the 7 and expansion slots. The internal 8 serves as the mass storage device for data files and software applications. An 9 makes it possible to read from and write to CDs and DVDs. Other hardware components typically found inside the computer case but not shown in the figure are a 10 , a 11 and a cooling mechanism such as a 12.

A computer system also needs 13 devices such as a keyboard and a mouse to interact with a user. A computer system also needs a display device such as a 14.

The hardware components described so far result in a fully functional computer system. A user can provide input using the keyboard and the mouse and the computer can process instructions, read and write information and display the results on the monitor.

Most present-day computer systems have additional hardware components to provide more functionality. These include input devices such as a 15 and 16 and output devices such as17 . These can be integrated into the other hardware components or connected as external devices. Additional peripheral devices can be connected to the computer systems such as an 18 to input paper documents as digital files, a 19 to print out documents and an external hard disk drive for extra mass storage.

Computer hardware is a general term to describe all the physical parts of a computer system. Typical computer system consists of a computer case, a power supply unit, a motherboard, a central processing unit (CPU), main memory and a hard disk drive.

Input devices include a keyboard, mouse, microphone, video camera and image scanner. Output devices include a monitor, speakers and a printer.

2a Match these words from the text (1-9) with the correct meanings (a-i).

1 software

2 peripherals

3 main memory

4 hard drive (also known as hard disk)

5 hardware

6 input

7 ports

8 output

9 central processing unit (CPU)

a) the brain of the computer b) physical parts that make up a computer system c) programs which can be used on a particular computer system

d) the information which is presented to the computer

e) results produced by a computer

f) input devices attached to the CPU

g) section that holds programs and data while they are executed or processed

h) magnetic device used to store information

i) sockets into which an external device may be connected

2b Using the text make collocations

1 perform a) the results

2 integrate into b) as the mass storage device

3 convert c) documents

4 to be mounted d) user

5 interact e) a portable unit

6 process f) electricity

7 print out g) operations

8 display h) on a plastic board

9 serve i) input

10 provide j) instruction