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Figure 4 Circuit and Phasor Diagram | Up
Electrical Science Volume 3 of 4 | Next
IMPEDANCE |
CAPACITANCE
Basic AC Reactive Components
2.
Current flowing in the circuit
I
E
XC
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 (XC).
The formula for calculating XC is:
XC
1
2pfC
Current (I) leads applied voltage by 90o 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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