Resistor Example
+- - - - - - - - - - - - -+ |AA BB CC DD | ---|AA BB CC DD |--- |AA BB CC DD | +- - - - - - - - - - - - -+
band A is first significant figure of resistance value in ohms
band B is the second significant figure
band C is the decimal multiplier
band D if present, indicates tolerance of value in percent (no color means 20%)
color sig fig decimal tolerance of band or # 0s multiplier +/-
black 0 10^0 brown 1 10^1 1% red 2 10^2 2% orange 3 10^3 3% yellow 4 10^4 4% green 5 10^5 blue 6 10^6 violet 7 10^7 gray 8 10^8 white 9 10^9 gold 0.1 5% (or letter "J") silver 0.01 10% (or letter "K") no color 20% (or letter "M")
Resistors are measured in ohms, so yellow violet red brown means 4700 ohms, 1% tolerance.
Capacitors are measured in pF, so yellow violet red means 4.7nF.
An alternative method of marking components is to write the digits and power of ten involved. Eg a resistor marked 472 is 4700 ohms; a capacitor marked 104 is 100nF (100000pF).
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