1, resistance
It is an element that can block AC and DC currents to some extent, and plays the role of voltage reduction, voltage division and cross-linking in the circuit.
2. Capacitance
It is a capacitive element composed of two mutually insulated plates, which plays an insulating role in DC and plays a different number of conductive roles with the size of capacitive reactance in AC. It is mainly used in circuits that separate DC from AC and bypass.
3. Inductance coefficient
It consists of coils with different turns. For DC, this is also a pure resistance. For alternating current, its inductance is related to frequency. The higher the frequency, the harder it is to pass.