AC2 Fundamentals Unit 2 – Series Resonance
UNIT 2 – SERIES RESONANCE
UNIT OBJECTIVE
At the completion of this unit, you will be able to analyze series resonant RLC circuits by using
calculations and measurements.
UNIT FUNDAMENTALS
An increase in frequency (f) causes the inductive reactance (XL) to increase. A decrease in
frequency causes the inductive reactance (XL) to decrease.
At some frequency, the inductive and capacitive reactances are equal in a series RLC circuit.
This frequency is called the resonant frequency (fr). To calculate resonant frequency, apply the
following formula.
1
fr = ───────
2 π√LC