Larger capacitors (the cylindrical aluminum electrolyte type or the double-layer type) use units of microfarads (uF or F), equal to 10 -6 farads. 9.Log in Sign up Terms of Use We use cookies to make wikiHow great.Ralph Childers is a master electrician based in the Portland, Oregon area with over 30 years of conducting and teaching electrical work.Ralph received his B.S.
Standard Capacitor Values License As WellElectrical Engineering from the University of Louisiana at Lafeyette and holds an Oregon Journeyman Electrical License as well as electrician licenses in Louisiana and Texas. This article received 27 testimonials and 92 of readers who voted found it helpful, earning it our reader-approved status. Physically small capacitors are especially difficult to read, due to the limited space available for printing. The information in this article should help you read almost all modern consumer capacitors. Dont be surprised if your information is printed in a different order than the one described here, or if voltage and tolerance info is missing from your capacitor. For many low-voltage DIY circuits, the only information you need is the capacitance. This value is much too large for ordinary circuits, so household capacitors are labeled with one of the following units: 1. Most large capacitors have a capacitance value written on the side. Slight variations are common, so look for the value that most closely matches the units above. Some capacitors list a tolerance, or the maximum expected range in capacitance compared to its listed value. This isnt important in all circuits, but you may need to pay attention to this if you require a precise capacitor value. If there is room on the body of the capacitor, the manufacturer usually lists voltage as a number followed by a V, VDC, VDCW, or WV (for Working Voltage). If there is no symbol at all, reserve the cap for low-voltage circuits only. Standard Capacitor Values How To Convert TheDo not use a DC capacitor unless you have an in-depth knowledge of how to convert the voltage rating, and how to use that type of capacitor safely in AC applications. If you see one of these next to a terminal, the capacitor is polarized. Make sure to connect the capacitors end to the positive side of the circuit, or the capacitor could eventually cause a short or even explode. Traditionally, this mark designates the - end on an aluminum electrolytic capacitor (which are usually shaped like tin cans). On tantalum electrolytic capacitors (which are very small), this mark designates the end. Standard Capacitor Values Code When TheOlder capacitors are less predictable, but almost all modern examples use the EIA standard code when the capacitor is too small to write out the capacitance in full. To start, write down the first two digits, then decide what to do next based on your code: 8. The smallest capacitors (made from ceramic, film, or tantalum) use units of picofarads (pF), equal to 10 -12 farads. Larger capacitors (the cylindrical aluminum electrolyte type or the double-layer type) use units of microfarads (uF or F), equal to 10 -6 farads.
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