So to find currents and voltages in a dc rl circuit whose inductors have just been switched into the circuit replace all inductors with open circuits. They are used to block ac while allowing dc to pass.
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Inductor blocks ac while allowing dc to flow because it only resists the change in current.
Inductors in ac and dc circuits. An inductor will basically behave and produce a short across itself when subjected to a dc while offer an opposing or restricting response when applied with an ac. Alternating current in a simple inductive circuit is equal to the voltage in volts divided by the inductive reactance in ohms just as either alternating or direct current in a simple resistive circuit is. However since the current in a dc circuit is constant there is no induced voltage developed instantaneously across the inductor.
So for a dc is concerned inductor acts as an magnet hence its called as electromagnet. Read about ac inductor circuits reactance and. They are also used in electronic filters to separate signals of different frequencies and in combination with capacitors to make tuned circuits used to tune radio and tv receivers.
The inductor does resist the initial inrush of current based on the time constant of the circuit. The very large voltage spikes produced can then be rectified by special high voltage diodes to produce dc voltages of thousands of volts. Inductors designed for this purpose are called chokes.
However in an alternating current circuit which contains an ac inductance the flow of current through an inductor behaves very differently to that of a steady state dc voltage. If a dc current current that does not vary over time is applied to an inductor it behaves like a short circuit. In an ac circuit the current is constantly reversing itself.
In some circuits however where high voltages are required this effect can also be used to advantage by applying a square wave to an inductor. When an inductor with no current flowing through it is first switched into a circuit it behaves like an open circuit. Now in an ac circuit the opposition to the current flowing through the coils windings not only depends upon the inductance of the coil but also the frequency of the applied voltage waveform as it varies from its positive to negative values.
The current will pass through the inductor with no opposition. Therefore inductors and capacitors complement each when used together in an electronic circuit. Inductor in dc and ac the inductor and the direct current dc an inductor is made from a conductive wire forming something similar to a spring coil.
Can we use inductor in dc circuit. An inductor will offer greater opposition to the passage of current and vice versa. So inductors have a major impact on the circuit.
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