resistance
Resistance in a circuit with the "R" add digital representation, such as: resistance of R15 said number is 15. The main role of resistance in the circuit for shunt, current limiting, partial pressure, offset, filtering, and capacitor combination) and impedance matching, etc.
Parameter identification: the unit of resistance is the ohm (Ω), multiplying power units are: the thousand Ω (K), megohm Ω (M), etc. The conversion method is: 1 megohm = 1 million = 1 million euro
Resistance of the parameter annotation method has 3 kinds, namely the direct standard method, color standard method and standard method.
Several standard method is mainly used in SMT circuit such as small volume, such as:
Said 47 472 x 102 Ω (4.7 K); 104 is 100 k color ring tagging method most used, now, for example, is as follows:
Four color ring resistance
Five color ring resistance (precision electric resistance) resistance of color code position and ratio relationships shown in the table below:
Effective digital color ratio allowable deviation (%)
Silver / 10-2-10
Gold / 10-1-5
Black 0 100 /
Brown 1 101-1
Red 2 to 102 + 2
3, 103 / orange
4, 104 / yellow
Green 5 to 105 + 0.5
Blue 6 106 + / - 0.2
Purple 7 to 107 + 0.1
Gray 8, 108 /
White 9 + 5 to 109-20