a resistance of 100ohm and a pure inductor are connected in series to an AC source of 110V and 50hz find the value of inductance to make the power factor equal to 0.6 calculate the phase difference between voltage and current
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Home / Inductors / Inductive Reactance
Inductive Reactance
Inductive Reactance of a coil depends on the frequency of the applied voltage as reactance is directly proportional to frequency
So far we have looked at the behaviour of inductors connected to DC supplies and hopefully by now we know that when a DC voltage is applied across an inductor, the growth of the current through it is not instant but is determined by the inductors self-induced or back emf value.
Also we saw that the inductors current continues to rise until it reaches its maximum steady state condition after five time constants. The maximum current flowing through an inductive coil is limited only by the resistive part of the coils windings in Ohms, and as we know from Ohms law, this is determined by the ratio of voltage over current, V/R.
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. The effect of a sinusoidal supply produces 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, more commonly known as Impedance (Z), of the circuit. But resistance is always associated with DC circuits so to distinguish DC resistance from AC resistance the term Reactance is generally used.
Just like resistance, the value of reactance is also measured in Ohm’s but is given the symbol X, (uppercase letter “X”), to distinguish it from a purely resistive value.
As the component we are interested in is an inductor, the reactance of an inductor is therefore called “Inductive Reactance”. In other words, an inductors electrical resistance when used in an AC circuit is called Inductive Reactance.
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Explanation:
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