Component Identification
EiA, Industrial Centre, The Hong Kong Polytechnic University GEP-RC_Identification_HO-r1F9
Resistors Identification
Resistance is measured in units of ohms (Ω). Resistors come in several sizes and shapes. Each one with
its color code or value printed on it.
Common unit: MΩ, kΩ and Ω. (M=10
6
, k=10
3
)
e.g. A four color bank resistor
Color bank order:
Red=2, violet=7, green=5, gold=±5%
The first two banks are resistor's value.
Resistance:
27
×10
5
=2,700,000
Ω
(
±5
%)
The standard color code is as follows:
Color
Resistor's
value
(1st and 2nd
band)
Multiplier
(3rd
band)
Tolerance
(4th
band)
Black
0
×10
0
–
Brown
1
×10
1
±1%
Red
2
×10
2
±2%
Orange
3
×10
3
–
Yellow
4
×10
4
–
Green
5
×10
5
–
Blue
6
×10
6
–
Violet
7
×10
7
–
Gray
8
×10
8
–
White
9
×10
9
–
Gold
–
×10
-
1
±5%
Silver
–
×10
-
2
±10%
None
–
–
±20%
=2.7MΩ or 2.7M in short-hand Carbon composition resistor
construction
Film resistor construction
Wirewound resistor construction
0.25W
2W
0.5W
1W
