In Direct circuit what's the role of inductor please explain me ?
Answers
What is the use of inductors in a circuit?
There can be multiple uses for inductors in a circuit.
An inductor has the property that the current through it cannot change instantaneously, so it can be used as a protection device for current transients (rapid changes in current that can damage components) if used in series with those components. The Brick Wall type surge protectors use a large inductor in series with the output to depress current spikes.
An inductor also functions as a low-pass filter since fast-changing signal currents are not stable long enough to overcome the reverse EMF (electro-motive force) that the inductor generates in response to a change in current. By the time the EMF begins to recede so that current could flow, a new change in the current has generated a new EMF in response.
An inductor that is magnetically coupled with another inductor is a transformer and this allows an alternating signal to induce another alternating signal magnetically with no actually electrical connection. This means that damage that occurs to one circuit that is coupled to another circuit via a transformer won’t necessarily occur in the other circuit, especially since the inductive parts of the transformer are a low-pass filter. Also, the inputs to loads that don’t optimally match an output circuit (one with an alternating signal, such as audio) can be routed through a transformer instead of a direct connection to “match” the output impedance of the control circuit to the input impedance of the load circuit. This improves efficiency and can protect high-impedance loads from high-current outputs and low-impedance loads from high-voltage outputs.
Transformers also allow an alternating signal at one voltage level to be changed to another alternating signal at a different voltage. They are, in fact, different signals but the signals are corresponding in frequency, phase, and current. The product of the current in the “secondary” inductor and the voltage across the secondary inductor is equal to the product of the current in the “primary” inductor and the voltage across the primary inductor. If the voltage on the primary “coil” is greater than that across the secondary coil, then this is called a “step-down” transformer. These are used often in non-switching, linear power supplies.
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