Created By : Vaibhavi Kumari

Reviewed By : Phani Ponnapalli

Last Updated : May 10, 2023

The RC Circuit Calculator is a free online tool that calculates the characteristic frequency of a circuit using capacitance and resistance. To discover the result as quickly as possible, simply enter the input details and push the calculate button.

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What is the best way to find frequency?

The steps to finding the characteristic frequency of an RC circuit are listed below. Follow these guidelines to get the best results for your numbers in less time.

  • Step 1: Calculate resistance and capacitance.
  • Step 2: Multiply the resistance and capacitance values together.
  • Step 3: Multiply the result by 2π.
  • Step 4: To check the characteristic frequency, get the reciprocal of the product.

RC Circuit Formula

The RC circuit is made up of a resistor and a capacitor. It is a circuit in which a resistance resistor is coupled in series with a capacitance capacitor.

There are two uses of the characteristic frequency. The RC Circuit is utilised as a capacitor charging time and as a filter. The following is the formula for calculating the RC Circuit's characteristic frequency

f = 1/(2π x R x C)

  • Where, R = resistance of the resistor
  • C = capacitance of the capacitor
  • f = characteristic frequency

The capacitor charge time formula is t = R x C

RC Filter

The frequency of signals that can flow through the circuit is determined by the characteristic frequency, f. Signals with frequencies smaller than f are suppressed by the RC circuit, whereas signals with frequencies greater than f can flow freely. Signals with frequencies around f are still partially transmitted, therefore this is not a clear-cut scenario. The RC filter can be used to filter out low or high frequencies depending on the design. The high pass and low pass filters are these.

When a low pass and a high pass filter are combined, you get a broadband filter that suppresses all sounds below and above certain frequencies. Broadband filters are installed in every piece of music equipment we have.

Capacitor Charge Time Calculator

When we connect the RC circuit to a DC power supply, the capacitor begins to accumulate electric charge and continues to do so until it is fully charged. The time it takes is determined by the capacitance of the capacitor C and the resistance of the resistor R that controls the current, or the amount of charge that enters the capacitor every second.

The longer it takes to charge the capacitor, the higher the capacitance or resistance. The capacitor's charging is an exponential process, indicating that the more charge there is, the longer it takes to gather more. The capacitor charge time is the time it takes to charge the capacitor to roughly 63 per cent capacity. You get roughly 87 percent if you double the time. Click the Advanced Mode to see the capacitor charge time calculator.

For more concepts check out to get quick answers by using this free tool.

How to Use the RC Circuit Calculator?

The following is the procedure on how to use the RC Circuit Calculator

  • Step 1: Input the unknown value's voltage, capacitance, resistance and x in the appropriate input fields.
  • Step 2: To acquire the result, click the "Calculate the Unknown" button.
  • Step 3: Finally, the output field will show the maximum energy, current, charge and time constant value.

RC Circuit Examples

Question 1: In the RC Circuit, the capacitance and resistance are 50 Ω and 20 F, respectively. Find its characteristic frequency?


Given: Resistance R = 50Ω

Capacitance C = 20 F

Characteristic Frequency f = 1/(2π x R x C)

f = 1/(2π x 50 x 20)

= 159.15 x 10^-6 Hz

Hence, the characteristic frequency in RC Circuit is 159.15 x 10^-6 Hz.

FAQs on RC Circuit

1. What is the purpose of an RC Circuit?

RC Circuits: In a circuit, capacitors and resistors are frequently found together. In real life, such RC circuits are common. They are employed in camera flashes, heart pacemakers, and a variety of other electrical equipment to control the speed of a car's windshield wipers and the timing of traffic signals.

2. What is the name of the RC circuit?

An electric circuit made up of resistors and capacitors is known as a resistor-capacitor circuit (RC circuit), RC filter, or RC network.

3. In physics, what is an RC circuit?

In physics, an RC circuit is also called resistance and capacitance The capacitor, as described in Capacitance, is an electrical component that holds electric charge while also storing energy in an electric field.

4. What makes the RC and LC filters different?

Low-power signals are well-suited to RC filtering. For filtering high-power signals, LC is ideal.

5. What are examples of RC Circuits?

RC circuits are frequently used to control time. Windshield wipers, strobe lights, and flashbulbs in a camera, as well as some pacemakers, are examples.