RLC Circuit Calculator
Calculate impedance, current, and resonance for an RLC circuit.
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Enter the resistance, inductance, capacitance, operating frequency, and supply voltage. The calculator shows the impedance, current, phase angle, resonant frequency, and the individual reactances.
About RLC Circuit
The RLC series circuit is a fundamental AC circuit that exhibits resonance. The impedance combines the resistance with the inductive reactance (XL = 2 pi fL) and capacitive reactance (XC = 1/(2 pi fC)). At the resonant frequency f0 = 1/(2 pi sqrt(LC)), the reactances cancel and current reaches its maximum. RLC circuits are used in radio tuners, bandpass filters, oscillators, and power factor correction systems.
Frequently Asked Questions
What is an RLC circuit?
An RLC circuit contains a resistor (R), inductor (L), and capacitor (C). In series, the impedance depends on frequency, making it useful for tuning and filtering applications.
What happens at resonant frequency?
At resonance, inductive and capacitive reactances cancel out. The impedance equals just the resistance, current is maximum, and the phase angle is zero.
What is impedance?
Impedance is the total opposition to current flow in an AC circuit. It combines resistance and reactance (from inductors and capacitors) as a complex quantity measured in ohms.