A computer system-Exercise

We did a lesson with Mr.Gari and he gave us this exercise as a homework on page 4.
1) The main part of a computer system is (C.P.U) central processing unit, which contains three important equipment to work directly. These are called Control Unit, Arithmetic and Logic Unit and Main Memory.
2) The Arithmetic and Logic Unit gets common pulses from the control unit and it serves as an interface between the peripheral units and the main main memory. It contains wired operators and registers and they deal with calgulations.
3) The main memory stores the data being processed and the program controls the processing. Although being like that, there is some differences between main memory and back-up storage. Back-up storage saves large quantities of data on media such as magnetic tapes that may be removed from the C.P.U and we can get information when we want to have it from it.
4) We can give two examples for back-up storage for instant magnetic disks and magnetic tapes. We can save or store large quantities of data on such as them.
5) A front front-end processor controls the flow of data between C.P.U and various peripherals devices.
6) Peripheral units surround the C.P.U. For instance,several input peripherals, output peripherals and also input and output peripherals.
7) I/O devices are input/output peripherals. Input peripherals convey the data from the external world to the Central Processing Unit. Output peripherals give the results of the processing of data on devices. For example printers are the most common output devices.
8) We can use these words for peripherals. Online peripherals devices directly connected to the CPU as opposed to offline peripherals ( e.g. card-punches).
9) Data acquisition consists of editing raw data so that it can be fed into a computer in a form the computer can recognise.
10) After being recognised by computer, the data is processed and the results either printed or displayed on a screen. These are called hard copy and soft copy.
11) A mainframe system is protected against a power cut. A power cut can result in the breakdown of the computer also the loss of all data, which is being processed.
12) An efficient system should have air-conditioning and dust must be kept to a minimum. Also it must regulate fluctuation in voltage from the mains supply.