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Inductive Reactance Inertial Mass Acceleration of water in a pipe (rA)v v F (t ) m t requires force to move a mass. An inductor creates an emf proportional to a change in current. • Magnetic field in the coil i The field acts as a mass that L V (t ) L I (t ) t reduces change in the current. Inductor Alone An AC source provides a sinusoidal voltage. • Inductor matches • One loop circuit The inductor voltage varies with the current. The voltage is related to the rate of change of the current. v L vL V0 sin t V0 sin t L i i t 1 V0 cos t L Phase Shift Voltage and current are not in phase through an inductor. • Voltage leads current: ELI the ICE man Ohm for Inductors The amplitude of voltage and current through an inductor are related. The ratio gives an expression like Ohm’s law. This is the inductive reactance. • Measured in ohms L v vL V0 sin t V0 i V0 V cos t 0 L L XL vL i V0 V0 L L Frequency Dependent Inductive reactance depends XL X L 2fL linearly on frequency. • Low reactance at low frequency • High reactance at high frequency DC has no inductive reactance. f • Equal to zero frequency Different Response Inductors and capacitors react differently with changes to frequency. • Resistors stay the same Consider reactances that are equal at a frequency ω0. • Capacitive reactance higher for low frequency • Inductive reactance higher for high freqency Resistance vs Reactance Resistance is measured in ohms. Resistance doesn’t depend on frequency. Reactance is measured in ohms. Reactance depends on frequency. • 1/C or L Resistance doesn’t affect the phase. Reactance shifts the phase. • ELI the ICE man next