# Basic Knowledge of Capacitor

Nominal capacitance and capacitance tolerance: the capacitance to store electric charge. Commonly used units are F, uF, and pF. The capacitance number marked on the capacitor is the nominal capacity of the capacitor. There is deviation between the nominal capacity of a capacitor and its actual capacity. Generally, the capacity is written directly on the capacitor, and numbers are also used to mark the capacity. Usually, when the capacity is less than 10000pF, the unit is pF, and when it is greater than 10000pF, the unit is uF. For the sake of simplicity, capacitors larger than 100pF and smaller than 1uF are often not marked with units. If there is no decimal point, its unit is pF, and if there is a decimal point, its unit is uF. If some capacitors are marked with “332″ (3300pF) with three significant digits, the two digits from the left give the first and second digits of the capacitance, and the third digit indicates the number with 0 after it, the unit It is pF.

Rated operational voltage: Within the specified operating temperature range, the capacitor can work reliably for a long time, and the maximum DC voltage it can withstand is the withstand voltage of the capacitor, also called the DC operating voltage of the capacitor. If it is in an AC circuit, it should be noted that the maximum AC voltage applied cannot exceed the DC working voltage value of the capacitor.

Key points: Commonly used fixed capacitor operating voltages are 6.3V10V16V25V50V63V100V250V400V500V630V1000V

Post time: Nov-23-2020