Because the capacity that the capacitor can hold is limited, it is marked with a certain unit. When choosing a capacitor, not only must the capacity be considered, but also the conversion relationship of the capacitor unit must be understood. This can avoid choosing the wrong capacity due to negligence of the conversion relationship.

Capacitors with a capacity of 1uF or more directly indicate the capacity with numerical values. For example, 10000uF, 3300uF. Take pF as the unit: the first digit and the second digit represent the capacitance value. The third number represents the power of 10, which is the number of 0s behind the value. For example, the capacitance capacity is marked as 104, which means that there are four zeros after 10, that is, 100000pF. In addition, the unit is nF: the capacitance capacity label is 100nF, which means 100x10-9 = 10-7F, which is also equal to 0.1x10-6F, so it is equal to 0.1uF.

The above relationship can be expressed as: 1 farad = 103 millifarad = 106 microfarad = 109 nanofarad = 1012 picofarad. The letter notation: 1mF = 1000 uF 1uF = 1000nF 1nF = 1000pF. Digital representation: Generally, three digits are used to indicate the size of the capacity, the first two digits represent significant digits, and the third digit is the magnification. Generally speaking, these are the ways to express capacitance. The capacitor units used in different representations are also different.

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