Macca High School

THE POWER -SUPPLY UNIT The components of a personal computer needed 5 volt and 12 volt voltage current supply since they needed low voltage current A device which converts high voltage current to voltage current is required this device is called power supply using it is placed inside the system unit

RAM RAM stands for Random Access Memory it is also known as read and write memory all information can be written 12 and read from Ram it holds the data temporally as long as the power is not cut off interrupted while working on a computer.

ROM ROM stands for read only memory it holds data permanently but information can only be read and not written on to Rome Rome for the Information Bulletin need this information comprises programs and other instructions required to execute programs on the system.

The control unit The control unit control everything that happens inside the computer it also features data from the memory sends it to a l u for processing and then send through the process the data back to the memory. all the Arithmetic and logical problems are solved in ALU (Arithmetic /Logic Unit),which is part of the computer.

Integrated circuits An integrated circuit is a circuit in which some transistors are fabricated any single piece of semiconductor material it is a group of electronic components like a transistors resistors and capacitors connected by means of voice it is also called the ship computers are rebuild using two kinds of IC chips they are Logic chips Memory chips

Memory chips are used to in the memory to hold data and instructions Things to remember The system unit is the main part of the computer because CPU is placed inside it The motherboard is a printed circuit board or PCB where are all the electrical circuits are printed The power supply unit is a device which converts high voltage current to voltage current required by the components of PC Main memory determine the amount of data that can be stored in the computer as well as the amount of data that it can process

Here given be l ow please add a shortcut keys Ctrl +a =select all Ctrl +Z =Undo Ctrl +c =to copy and data are selected data which is copied. Ctrl +x =to cut selected data or temporary deleting the selected data. Ctrl + v =for paste or the shortcut key is used for to make number of copies using the shortcut key. Ctrl + p = to print or to make a hard copy Ctrl + h = replace to any other words Ctrl + F = find a word or sentence Control + n = to open a new empty document Control + o= to open open the already saved documents Control + s = to save the document.