The main circuit board of a microcomputer, contains the CPU, memory, expansion slots and all the controllers required to control standard hardware devices
The place in a computer where the operating system, application programs, and data in current use are kept, it is a temporary memory and can be compared to a person's short-term memory
The power supply, as its name implies, provides the necessary electrical power to make the PC operate. The power supply takes standard electrical power and converts it into power your PC can use
The keyboard is also connected to the system unit and it is used primarily to enter information into the computer. This information entering is done by typing
The ENTER KEY is used to confirm an input or when data is incomplete, the TAB KEY (Tabulation) is a key for indention, the SPACE BAR is the longest, horizontal key at the bottom of the keyboard, when pressed it will enter space between characters, BACKSPACE is indicated with a left arrow, its function is to erase a previous character or text, the CAPSLOCK KEY is the key for typing all capital, the ESCAPE KEY (ESC) is used to quit current task running