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Resistor colour code
 It is useful to be able to remember the colour code that refers to resistors or any other electronic component for that matter

However if you are taking GCSE you will be invariably given a colour code to work with.

Having an incomplete knowledge is not therefore the handicap it could be.

The resistor colour code is given below.


Black
0
Brown
1
Red
2
Orange
3
Yellow
4
Green
5
Blue
6
Violet
7
Grey
8
White
9

Most resistors have 4 or 5 bands on the resistor, some even have a sixth.
In the GCSE exam you will probably be asked on a 4 band resistor.

The first 3 colours refer to calculating the resistors value (the 4th colour indicates the tolerance)
The 3 rd colour is the multiplier 

The colour code on a 4 band resistor. orange, yellow, orange and gold would equate to :-

3(orange) 4(yellow) the multiplier would be 000(orange)  =  34  (000)  =34k  5% tolerance (see below)

The multiplier colour code is given below.


Black  
Brown
0
Red
00
Orange
000
Yellow
0,000
Green
00,000
Blue
000,000

The  final band of a resistor is the tolerance band.

The tolerance color code is given below


Silver  +or- 10%
Gold  +or-  5%
Brown  +or-  1%
Red  +or-  2%
Green  +or-  0.5%
Blue  +or-  0.25%
Violet  +or-  0.1%

Most exam questions would refer to a 4 band resistor, a 5 band colour resistor differs in the fact that the first 3 colours are used to determine the value of the resistor with the 4th (next to last) being the multiplier.

For example A resistor with the codes orange, blue, black, orange and silver would equate to :-

3(orange), 6(blue), 1(black)  the multiplier would be 000(orange)  =   361 000 = 361k +or- 10% (silver)

The 6th  band colour code refers to the temperature coefficient, resistance of any conductor will change with temperature.
High tolerance and high temperature rated resistors are specialist components and you are unlikely to meet them in amateur electronics I have included them so that you will recognize them if  you should do so.
 



 

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