Analyse a series RC circuit for impedance, phase angle and filter response.
Taking the output across the capacitor gives a low-pass response; across the resistor gives high-pass. At the cutoff frequency the reactance equals the resistance and the output is 3 dB down. A single RC stage rolls off at only 6 dB per octave, which is why steeper filtering needs multiple stages or active designs.
RC Circuit
Z = √(R² + X_C²); f_c = 1 ÷ (2πRC)
Z = √(R² + X_C²); f_c = 1 ÷ (2πRC) Taking the output across the capacitor gives a low-pass response; across the resistor gives high-pass. At the cutoff frequency the reactance equals the resistance and the output is 3 dB down.
A single RC stage rolls off at only 6 dB per octave, which is why steeper filtering needs multiple stages or active designs.
This calculator takes 4 inputs: Resistance, Capacitance, Signal frequency, Input voltage. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.