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RC Calculator

Input
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Output
V

About Time Domain

An RC circuit is an extremely common circuit configuration, one that you can find by itself or, more frequently, as part of a bigger circuit. Also, sometimes RC circuits are unintentional and simply parasitic in nature. With this calculator, you can get an intuitive understanding of what happens with a charging and discharging RC circuit in the time domain.

With only the values of the resistor and capacitor, we can find the time constant of the RC circuit, also known as tau, which is the amount of time required to charge or discharge a capacitor in series with a resistor to 63.2% of the initial charge voltage. For example, if you are charging from 0 to 10 volts, then the time constant is how long it takes to reach 6.32 volts. The capacitor charge time, to become fully charged, is considered to be 5 time constants.

Input
Choose a unit
Choose a unit
Output
Hz

About Frequency Domain

An RC circuit is an extremely common circuit configuration, one that you can find by itself or, more frequently, as part of a bigger circuit. Also, sometimes RC circuits are unintentional and simply parasitic in nature. With this calculator, you can get an intuitive understanding what happens when an AC signal of varying frequency passes through one.

RC circuits act as a low pass filter in the time domain. This means that with lower frequency AC signals, the signal can pass through fairly easily. However, as the frequency increases, the signal is attenuated, or blocked, by the RC block. Where the frequency starts to become truly diminished, and a roll off in the output occurs, is considered to be at the 3dB point, also known as the half power point. This is also called the frequency cutoff point, or FC. As the resistance or capacitance increases, the frequency that this occurs at drops.

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