Summary of Reactance and Resonance Circuits

Summary

● Ohm’s law applies to AC circuits, just as it does to DC circuits.

● The AC current lags the voltage by 90° in an inductor (ELI).

● The AC current leads the voltage by 90° in a capacitor (ICE).

● Vector representation allows the use of trigono- metric functions to determine voltage or current when the phase angle is known.

● The combined effect of resistance and inductance or capacitance is called impedance.

● Apparent power is obtained by multiplying the source voltage and current with units of volt-amperes.

● The ratio of true power to apparent power in volts- amperes is called the power factor.

● The power factor is very important in the consideration of heavy industrial power distribution.

● Resonance circuits make it possible for a circuit to tune a station to a particular frequency.

● Resonance is desired for radio frequency in tuning circuits.

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