Capacitive Reactance Summary

Figure 4 Circuit and Phasor Diagram

IMPEDANCE

Electrical Science Volume 3 of 4
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CAPACITANCE Basic AC Reactive Components 2. Current flowing in the circuit I E X_C 120 265.4 I 0.452 amps 3. Phasor diagram showing current leading voltage by 90° is drawn in Figure 4b. Summary Capacitive reactance is summarized below. Capacitive Reactance Summary Opposition to the flow of alternating current caused by capacitance is called capacitive reactance (X_C). The formula for calculating X_C is: X_C 1 2pfC Current (I) leads applied voltage by 90^o in a purely capacitive circuit. The phasor diagram shows the applied voltage (E) vector leading (below) the current (I) vector by the amount of the phase angle differential due to the relationship between voltage and current in a capacitive circuit. ES-08 Page 8 Rev. 0

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