Capacity of memory/computer

Capacity means The amount of information that can be stored on the medium.

Unit                 Description                Approximate Size

1 bit                1 binary digit

1 nibble            4 bits

1 byte               8 bits                            1 character

1 kilobyte       1,024 bytes                   »1/2 page, double spaced

1 megabyte    1,048,576 bytes            »500,000 pages

                       1 million bytes

1 gigabyte     1,073,741,824 bytes      »5 million pages

                      1 billion bytes 

1 terabyte       1 trillion bytes              »5 billion pages

Names of different types of keys at keyboard

It is the primary input device for entering text and numbers. A standard keyboard includes about 100 keys; each key sends a different signal to the CPU.

Names of keys

Types of Computer

1.PERSONAL COMPUTER
2.MAINFRAME COMPUTER
3.MINICOMPUTER
4.SUPER COMPUTER