All the data stored in your computer-every word,picture, number, and sound- is captured
as a series of electrical pulses that are rither on or off. A number system called binary is used to represent these pulses
with "1" meaning "on" and "0" meaning "off". A single binary digit, Known as a "bit", switches a single switch on or off. by linking together these switches, the computer can carry out the complex operations we demand
Bits and bytes
1 bit= a binary digit,either 1 (on) or 0 (off)
1 byte= 8 bits
1 kilobyte= 1,000 bytes
1 gigabyte= 1,000,000,000 bytes
1 terabyte= 1.000,000,000,000 bytes.
How much data?
10 bytes= one word
2 kilobytes= one typewritten page
100 kilobytes= a low-resolution photograph
1 megabyte= a short noval
2 megabytes= a high-resolution photograph
100 megabytes= a shelf of novels 1 m (3 ft) long
1 gigabyte= 17 hours of digital music
10 terabytes= all the printed works in the Us Library of congress (the world's largest library)
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