AC Circuits: How to Calculate Inductive, Capacitive, and Equivalent Reactance
In AC circuits, inductance (produced by inductors) and capacitance (produced by capacitors) produce reactance (X). Reactance opposes changes in current or voltage.
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| A selection of low-value inductors |
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| Capacitors |
Inductive Reactance is computed by:
X_L = 2{\pi}fL
where:
f is frequency
L is inductance
Capacitive Reactance is computed by:
X_C = \frac{1}{2{\pi}fC}
where:
f is frequency
C is capacitance
f is frequency
C is capacitance
Equivalent Reactance is computed by:
X_{eq} = X_L - X_C
X_{eq} = X_L - X_C
Reactance is the nonresistive component of the impedance in an AC circuit. It is the imaginary part of the Impedance. It is measured in Ohms(Ω).
An inductor or capacitor in parallel with any such will have it's equivalent reactance computed differently from such. In other words, if an inductor is connected in parallel to a capacitor, their equivalent reactances will be computed individually.
If you have questions, place a comment below.
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The difference in capacitor sizes may be big enough to restrict the expected accuracy if the capacitor is part of a tuned filter. how to tell which wire is hot without a multimeter?
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