If a changing signal such as a sine wave is applied to this perfect inductor, the reactance impedes the flow of current, and follows Ohms law. In this case a perfect inductor is one that only has inductance, and no resistance or capacitance. Inductive reactance formulasĪlthough there is perfect inductors do not exist, it is helpful to imagine one to look at the formulas and calculations associated with inductors and inductance. In this way the induced voltage will work against the voltage causing the current to flow and in this way it will impede the current flow. This voltage is proportional to the inductance and as a result of Lenz's law the induced voltage is in the opposite sense to the applied voltage. When a changing current is applied to an inductor, the self-inductance gives rise to an induced voltage. The reason for this inductive reactance can be simply seen by examining the self-inductance and its effect within the circuit. Any changing current in an inductor will be impeded as a result of the inductance associated with it. The effect by which the current flow of an alternating or changing current in an inductor is reduced is called its inductive reactance. The inductive reactance is frequency dependent – rising with frequency, but it can easily be calculated within straightforward formulas. The degree to which the inductor impedes the flow of current is due to its inductive reactance. No matter which way you calculate total impedance (Ohms Law or the. Any inductor resists a change in current as a result of Lenz’s Law. Figure 6.4 Pure inductive circuit: Inductor current lags inductor voltage by 90. Inductance Symbols Lenz's law Self inductance Inductive reactance calculations Inductive reactance theory Inductance of wire & coils TransformersĪn inductor resists the flow of an alternating current as a result of its inductance. Inductance and Transformer Tutorial Includes: Impedance Calculators is a pack of 8 calculators with circuits and formulas. Inductive Reactance Formula & Calculations Any inductor resists the changes of an alternating current and this results in it presenting an impedance to it.

Inductor impedance calculator