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Fixed inductors, also known as radio-frequency chokes, are electronic components used in a variety of electrical and electronic devices. They are usually cylindrical in shape and have two electrical terminals on one end, connected to a wire winding on the coil core. The coil core may be made of a ferrite material, but can also be made of air, powdered iron, or other material.The purpose of using a fixed inductor is to reduce risk of oscillation or feedback in a circuit. They also are used to filter out undesirable signals, reduce noise, and protect against overvoltage.In terms of their application fields, the main applications of fixed inductors include radio receivers, transmitters, signal and communication systems, automotive electronics, power electronics, and industrial electronics. They are also used for low voltage applications such as radio frequency electronic circuits, HF filters, and transistors.Fixed inductors are characterized by their inductance, which is a measure of the inductor’s ability to store and release energy. The inductance of a fixed inductor is related to the number of winding turns, the distance between winding turns, the diameter of the wire winding, and the size of the core material.The key working principles of a fixed inductor are based on Faraday’s law of induction. According to this law, a magnetic field is generated when electrical current flows through a coil. This magnetic field induces a voltage in the opposite direction, thus counteracting the force of the current. The magnitude of this counteracting force depends on the number of winding turns, the diameter of the wire, and the core material of the inductor.Fixed inductors are also used to reduce the flow of high frequency signals, which may cause electrical interference in the circuit. The inductance of the inductor is key in this case, as it works to reduce the amplitude of the signals. This is achieved by resisting the flow of electrons, thus diminishing the amplitude and making the current less powerful.Overall, fixed inductors are important components in many electronic devices, as they provide protection from overvoltage, reduce noise, filter out undesirable signals, and act as a filter capacitor. By understanding their application fields and working principles, electrical engineers can use fixed inductors to improve the performance of their circuitry.

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