When the frequency of the input voltage is low, the voltage across the capacitor drops and the output voltage remains very small. For this purpose, the output voltage across the inductance is tapped at a series circuit of inductance and capacitance. The LC high pass can pass high frequencies while weakening or blocking low frequencies. Our LC low pass calculator can calculate a 2nd order low pass. With decreasing frequency, however, the capacitive reactance of the capacitor increases and so does the tapped output voltage. Consequently, only a very small output voltage remains. At a high frequency, the reactance of the capacitor decreases and the reactance of the coil increases. The LC low pass is created by connecting the two elements in series, when the output voltage across the capacitor is tapped. Frequently used LC filter circuits are high pass, low pass, band pass and band stop filters. The type of filter depends on whether it is a series or parallel connection and at which point the output voltage is tapped. It can be built with an identical circuit different filters. Through the interconnection of coil and capacitor, a circuit is constructed whose output voltage changes with the frequency of the input voltage. The higher the frequency, the shorter the charging cycles of the capacitor and the lower its reactance. During this continuous charging and discharging, the capacitive reactance $X_C$ is created. Basically, the current does not really flow through the capacitor. In an AC circuit, however, it is permanently charged and discharged by the alternating current direction. The capacitor acts like a nearly infinite resistance in a DC circuit. The capacitor is, in principle, a battery with a very small capacity.
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