1 bit = 0 or 1
(high or low voltage) 

low voltage = 0 
high voltage = 1
or similar...

High Voltage 1
Low Voltage 0


1 bit
-----
0 0                  (2 to the power of 1 = 2 => 2 lines )
1 1

2 bits
------
0 00		   (2 to the power of 2 = 4 => 4 lines )
1 01
2 10
3 11

3 bits
------
2 to the power of 3 = 8 => 8 lines
2x2x2 =8

0	000
1	001
2	010
3	011
4	100
5	101
6	110
7	111

4 bits ?
--------
2 to the power of 4 = 16
2x2x2x2 =16


0	0000
1	0001
2	0010
3	0011
4	0100
5	0101
6	0110
7	0111

8	1000
9	1001
10	1010
11	1011
12	1100
13	1101
14	1110
15	1111



Decimal
-------
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19


Octal    Decimal
-----    -------
00    	0
01      1
02      2
03	3
04	4
05	5
06	6
07	7
10	8
11	9
12	10
13	11
14	12
15	13
16	14
17	15
20 	16
21	17
22	18
23	19
24	20
25	21
26	22
27	23

Units of storage
----------------
                                   01000001 
8 bits = 1 byte e.g. 01000001 e.g. LHLLLLLH

^ symbol represents to the power of

1 Kilobyte (KB)	= 2 ^ 10 bytes = 1024 bytes
1 Megabyte (MB) = 2 ^ 20 bytes = 1048576 bytes
1 Gigabyte (GB) = 2 ^ 30 bytes = 1073741824 bytes
1 Terabyte (TB) = 2 ^ 40 bytes = 1099511627776 bytes
1 Petabyte (PB) = 2 ^ 50 bytes = 1125899906842624 bytes