To reduce the confusion regarding letters, numbers and decimal points, an International colour coding scheme was developed many years ago as a simple way of identifying capacitor values and tolerances. For example, a capacitor can be labelled as, n47 = 0.47nF, 4n7 = 4.7nF or 47n = 47nF and so on.Īlso, sometimes capacitors are marked with the capital letter K to signify a value of one thousand pico-Farads, so for example, a capacitor with the markings of 100K would be 100 x 1000pF or 100nF. Instead letters such as p (pico) or n (nano) are used in place of the decimal point to identify its position and the weight of the number. However, when the value of the capacitance is of a decimal value problems arise with the marking of the “Decimal Point” as it could easily not be noticed resulting in a misreading of the actual capacitance value. Sometimes the actual values of capacitance, voltage or tolerance are marked onto the body of a capacitor in the form of alphanumeric characters. These coloured bands represent the capacitance value as per the colour code including voltage rating and tolerance. There are two common ways to know the capacitive value of a capacitor, by measuring it using a digital multimeter, or by reading the capacitor colour codes printed on it.
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