what happens when lr circuit is subjected to dc or ac supply

mak davis, 13 years ago

Grade:

1 Answers

SAGAR SINGH - IIT DELHI

878 Points

13 years ago

Dear student,

When an alternating or AC voltage is applied across an inductor the flow of current through it behaves very differently to that of an applied DC voltage, by producing a phase difference between the voltage and the current waveforms. Now in an AC circuit, the opposition to current flow through the coils windings not only depends upon the inductance of the coil but also the frequency of the AC waveform. The opposition to current flowing through a coil in an AC circuit is determined by the AC resistance of the circuit. But resistance is always associated with DC circuits so to distinguish DC resistance from AC resistance which is also known as Impedance, the term Reactance is used. Like resistance, reactance is also measured in Ohm's but is given the symbol "X" to distinguish it from a purely resistive value and as the component is an inductor, the reactance of an inductor is called inductive reactance. In other words, an inductors resistance in an AC circuit is called Inductive Reactance.

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