Basically, it is a wire link used to connect traces on a printed circuit board (PCB) that is packaged in the same physical package format as a resistor. Single Black Resistor Band or Zero Ohm ResistorĪ single black band on a resistor is called a zero-ohm resistor. To prevent metal and other particles from getting in the coating of high-voltage resistors, the gold and silver bands are often replaced with yellow and gray bands. The first two bands represent the significant digits, the 3rd band is a multiplication factor, the 4th band is for tolerance, and the 5th band is for the temperature coefficient (ppm/K). 5 Band Resistor With the 4th Band of Gold or SilverĪll 5 band resistors with the 4th band of silver or gold form an exception and are utilized on specific or older resistors. Below we'll go over some of the exceptions to the resistor color code.
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