The capacitor used to calculate or design in theory. To consider in the form of a capacitor are as shown in the picture 3-1 (), but in practice the capacitor elements that cause a loss. May the definition in the form of a capacitor with a parallel resistance, and as 3-1 image (b) makes the แสท flowing in the elements of the capacitor. Be divided to flow in the elements of the resistance. The impedance of the capacitor, the actual error from the calculation.From the equivalent circuit of the capacitor in the 3-1 (b) can be written as a phase diagram (Phase diagram) has also 3-2 images.
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