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A fixed inductor is an electronic component consisting of a coil of wire wrapped around a core. The core, which is usually made of iron, forms a magnetic field when a current is passed through the coil. This field induces a voltage in the coil, which can then be used to generate a current in another circuit.
The role of the fixed inductor is to store energy and to control the rate of current change. They are commonly found in electrical systems ranging from consumer applications such as household electronics to industrial applications such as electrical motors. They are also found in telecommunications systems, and can be used in power supplies, amplifiers, and other electronic circuitry.
Fixed inductors are typically rated in terms of their inductance, which is measured in Henrys (H). Inductance is the ability of a circuit to resist changes in current flow. The inductance of a given circuit is proportional to the number of turns of the coil, the core material used, and the core size. The higher the inductance, the larger the coil must be to contain the same amount of energy as a lower inductance.
In applications where high levels of current are expected, inductors are often rated by the RMS current they can carry. RMS stands for Root Mean Square and measures the amount of current a circuit can handle without causing significant distortion. The higher the RMS rating, the larger the coil must be, and the more expensive it will be.
In addition to size and inductance, inductors also differ in how they are wound, whether they are air- or ferrite-cored, and whether they are shielded or not. Air-cored inductors have no core, and therefore must be wound with more coils to achieve the same amount of inductance as a ferrite-cored inductor. Shielded inductors are used when it is necessary to reduce interference from other components in the circuit. Lastly, a fixed inductor will also have a maximum voltage rating, which indicates the amount of voltage the inductor can safely handle without causing damage.
Fixed inductors can be used in many different kinds of designs, including simple DC circuits, DC-DC converters, AC power supplies, filtering circuits, and many more. They can also be used in more complex applications such as motor controllers, power supplies, and signal processing circuits. Fixed inductors can be used to help reduce noise, boost signals, and change the load on a circuit. They can also be used in combination with resistors and capacitors to form filter networks known as LC filters.
Fixed inductors are widely available in a variety of sizes, shapes, and configurations. They are easy to use and relatively inexpensive, making them an ideal choice for many applications. Fixed inductors are essential components in any electronic system, and their use continues to expand as technology advances.

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