Computing notes / week 2

Page 1

Computer use millions of electronic circuits and switches which can either be On or Off​

On is represented by 1 and Off is represented by 0

0 or a 1 = 1 Bit (Binary Digit)

4 bits = 1nibble

8 Bits = 1 Bytes = 1 Kilobyte (Kb)​

1000es = 1 Kilobyte (Kb)​

1000Kb = 1 Megabyte (Mb)​

1000 Mb = 1 Gigabyte (Gb)​

1 Byte = 1 Character of text​

Electricity can’t be held it wobbles around and if touched you could die

Could only have things on or off

Information and data are 2 different things

Data is the stuff that goes in ( a number that doesn’t mean anything

Information is data in context

1000 kilo byte is 1 mega

1000 mega byte is 1 gigabyte

1000 gigabyte is one terabyte

1000 terabyte is a petabyte

Bytes states

1 2

2 4

3 8

4 16

5 32

6 64

7 128

8 256

0 – off

1 – on

Page 2

Decimal Binary

0

01

10

11

100

101

110

111

1000

1001

1010

It is a character-encoding scheme originally based on the English alphabet​

ASCII codes represent text in computers, communications equipment, and other devices that use text​

For example: a lower case ‘f’ is represented by the following combination of bits in the ASCII table​

f = 1100110 or in 8 Bits, 01100110​

8 bits is called a Byte ​