What are the characteristics of an inductor coil?
An inductor is a device that works on the principle of electromagnetic induction. When current flows through a wire, a certain electromagnetic field will be generated around the wire, and the wire of this electromagnetic field will induce the wires within the range of this electromagnetic field. The effect on the wire itself that generates the electromagnetic field is called "self-inductance", that is, the changing current generated by the wire itself generates a changing magnetic field, and this magnetic field further affects the current in the wire; the effect on other wires within the range of this electromagnetic field is called "mutual inductance".
The electrical characteristics of the inductor are opposite to those of the capacitor, "passing low frequencies and blocking high frequencies". When high-frequency signals pass through the inductor, they will encounter great resistance and it is difficult to pass; while the resistance presented to low-frequency signals passing through it is relatively small, that is, low-frequency signals can pass through it more easily. The resistance of the inductor to direct current is almost zero.
Resistance, capacitance and inductance, they all present a certain resistance to the flow of electrical signals in the circuit, and this resistance is called "impedance". The impedance presented by the inductor to the current signal uses the self-inductance of the coil. Inductor coils are sometimes referred to as "inductors" or "coils", and are represented by the letter "L". When winding an inductor coil, the number of turns of the coil is generally referred to as the "turns" of the coil.
