Wednesday, August 6, 2014

Resistance color coding

Resistance value can be easily determined from the color coding of resistance. The value of the resistor is marked on the body using colors. Every color is different number and you can remember these numbers or you can just use the table on next step. Below is interpretation for the same.
Colors

Here is the table with the colors and numbers. As you can see they are:
·         BLACK:     0
·         BROWN:   1
·         RED:           2
·         ORANGE:   3
·         YELLOW:   4
·         GREEN:       5
·         BLUE:          6
·         VIOLET:      7
·         GREY:          8
·         WHITE:        9
But this is not for all colors. From right to left the second color is multiplier. Digits from the first colors must be multiplied with the number of this color.
·         BLACK:     1
·         BROWN:   10
·         RED:           100
·         ORANGE:   1000
·         YELLOW:   10000
·         GREEN:       100000
·         BLUE:          1000000
·         GOLD:          0.1
·         SILVER:       0.01

Above Diagram is self explanatory in itself.
Last color represents the tolerance. Tolerance is the precision of the resistor and it is given as a percentage. For example a 390 resistor with a tolerance of ±10% will have a value within 10% of 390, between 390 - 39 = 351 and 390 + 39 = 429 (39 is 10% of 390).
·         BROWN:   1%
·         RED:           2%
·         GOLD:        5%
·         SILVER:     10%
·         NOTHING:  20%