Basic AC Reactive Components INDUCTANCEINDUCTANCEAny device relying on magnetism or magnetic fields to operate is aform of inductor. Motors, generators, transformers, and coils areinductors. The use of an inductor in a circuit can cause current andvoltage to become out-of-phase and inefficient unless corrected.EO 1.1 DESCRIBE inductive reactance (X_{L}).EO 1.2 Given the operation frequency (f) and the value ofinductance (L), CALCULATE the inductive reactance(X_{L}) of a simple circuit.EO 1.3 DESCRIBE the effect of the phase relationship betweencurrent and voltage in an inductive circuit.EO 1.4 DRAW a simple phasor diagram representing ACcurrent (I) and voltage (E) in an inductive circuit.InductiveReactanceIn an inductive AC circuit, the current is continually changing and is continuously inducing anEMF. Because this EMF opposes the continuous change in the flowing current, its effect ismeasured in ohms. This opposition of the inductance to the flow of an alternating current iscalled inductive reactance (X_{L}). Equation (8-1) is the mathematical representation of the currentflowing in a circuit that contains only inductive reactance.(8-1)IEX_{L}whereI = effective current (A)X_{L} = inductive reactance (W)E = effective voltage across the reactance (V)The value of X_{L} in any circuit is dependent on the inductance of the circuit and on the rate atwhich the current is changing through the circuit. This rate of change depends on the frequencyof the applied voltage. Equation (8-2) is the mathematical representation for X_{L}.(8-2)X_{L}2pfLRev. 0 Page 1 ES-08

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