Preferred component values are defined in british standard bs 24881. Normally this would be the value closest to the calculated one for the series you are using. Standard values used in capacitors, inductors and resistors. Technical articles standard values used in capacitors, inductors and resistors. Resistors are available in a number of standard ranges, often called preferred values these ranges, or series, are set out by the electronic industries association eia, and are e3, e6, e12, e24. Standard series values in a decade for resistances and. Successive values within a decade series are related approximately by a factor.
The actual resistance at the top of the tolerance band is 1. The 120 ohm resistor has a value ranging between 110 and ohms. Eseries values standard series values in a decade for. The tables below show the values for some of the more common preferred series. The electronic industries association eia, and other authorities, specify standard values for resistors, sometimes referred to as the preferred value system. Resistors and capacitors are available in a limited range of values, according to their manufacturing precision. Dcrcw e3 standard thick film chip resistors datasheet pdf.
In this video is explained what eseries and standard values for resistors are and how to use them. The most common preferred value series is the e24 series. Clicking calculate r1 and r2 will find the optimum pair of resistors from the selected range of preferred values, for a given v in and v out. The resistance of this component at the bottom of its tolerance band is 1. Standard series values in a decade for resistances and capacitances e3 to e192 according to iec 60063 e192 e96 e48 e192 e96 e48 e192 e96 e48 e192 e96 e48 e24 e12 e6 e3 100 100 100 178 178 178 316 316 316 562 562 562 10 10 10 10 101 180 320 569 11 102 102 182 182 324 324 576 576 12 12 104 184 328 583. Because of this, all resistors with a tolerance of 10% overlap. This physics video tutorial explains how to use the resistor color code chart to determine the value of the resistance of a resistor in an electric circuit. Preferred value series for resistors and capacitors. Take as an example a resistor that has a value of 1 ohm and a tolerance of 20%. Following this logic, the preferred values for 10% tolerance resistors between 100 and 1,000 ohms would be 100, 120, 150, 180, 220, 270, 330 and so on rounded appropriately. These standard resistor values are those which can be bought. The e series is a system of preferred numbers also called preferred values derived for use in electronic components. Standard resistor values 5% standard capacitor values 10%.