Date: Lesson Meeting people Lesson materials appendix lead in activity

Output devices, which let us extract the results (e.g. the monitor and the printer).

Storage devices, which are used to store information permanently (e.g. hard disks and DVD-RW drives). Disks drives are used to read and write data on disks. At the back of a computer there are ports into which we can plug external devices (e.g. a scanner, a modem, etc.). They allow communication between the computer and the devices.

Word	Description
Computer	An electronic machine
Hardware	an electronic or mechanical part of the computer
Software	a set of instructions, program
Main memory	the heart of the computer
CPU	holds the instructions and data
RAM (random access memory)	Internal memory of CPU for storing data, program, and program result (volatile)
Volatile storage	Needs constant power in order to store data
ROM (read only memory)	Permanently store data (non- volatile)
Non-volatile	Computer memory can retrieve information even after having been power cycled
Peripherals	physical units attached to the computer
Input devices	Provide data to a computer used for interaction and control
Output devices	Convert information into human – readable form