1. What is RC Circuit Resonant Frequency?

The resonant frequency of an RC circuit is the frequency at which the capacitive reactance equals the resistance. This is a key parameter in filter design and signal processing applications.

2. How Does the Calculator Work?

The calculator uses the RC frequency equation:

Where:

• \( f \) — Resonant frequency in Hertz (Hz)
• \( R \) — Resistance in Ohms (Ω)
• \( C \) — Capacitance in Farads (F)
• \( \pi \) — Mathematical constant (~3.14159)

Explanation: The equation shows the inverse relationship between frequency and the product of resistance and capacitance.

3. Importance of Resonant Frequency

Details: Knowing the resonant frequency is crucial for designing filters, timing circuits, and understanding circuit behavior in AC applications.

4. Using the Calculator

Tips: Enter resistance in ohms and capacitance in farads. For practical values, remember that 1μF = 0.000001F. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Is this the same as cutoff frequency?
A: Yes, for a simple RC circuit, the resonant frequency is the same as the cutoff frequency (-3dB point).

Q2: What happens at this frequency?
A: At this frequency, the output voltage is 70.7% of the input voltage (a -3dB reduction).

Q3: How does this differ from RLC resonance?
A: RC circuits don't have true resonance like RLC circuits, but this frequency marks the transition point in the frequency response.

Q4: Can I use this for high-pass filters?
A: Yes, the same formula applies to both low-pass and high-pass RC filters.

Q5: What are typical applications?
A: Used in audio filters, power supply filtering, signal conditioning, and timing circuits.