RESISTOR PROPERTIES, COLOR CODE CHART AND CALCULATOR 



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A resistor is a twoterminal electrical component used in electronic circuits to limit the flow of an electric current. Everyone who has dealt with the circuits knows about resistors. I'll just start with a brief introduction to their lesser understood physical meaning. In general, if the current flow i through an object inserted in a circuit is directly proportional to the voltage V across it, the ratio of V divided by i will be constant. This constant ratio is called resistance: R=V/i. In an ideal resistor R does not depend on the current over a considerable range of conditions. If by definition R=V/i, then i=V/R. This relationship is referred to as Ohm's law. 

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Note that only certain "standard" component values specified by Electronic Industries Association (EIA) and IEC publication 60063 may actually be available. See a complete printable standard decade resistor values table. Note that resistors may have different number of color bands depending on the tolerance. Below is an example of a 5 band color code. The same color scheme is used for small capacitors (in picofarads pF) and inductors (in microhenries µH), although they often have the numeric values actually stamped on them. Also see electrical formulas for series and parallel connections. 

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