Online RC Calculator

Calculate RC circuit parameters including time constant, capacitor voltage, and charge/discharge curves instantly.

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About This Tool

This online RC calculator helps you analyze resistor-capacitor (RC) circuits by computing key parameters. Enter resistance (R), capacitance (C), voltage (V), and time (t) to calculate the time constant (τ = R*C), capacitor voltage during charging (Vc = V*(1 - e^(-t/τ))) and discharging (Vc = V*e^(-t/τ)), and visualize charge/discharge behavior. Perfect for electronics hobbyists, students, and engineers designing or troubleshooting RC circuits.

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How to Use

Enter resistance in ohms (Ω) and capacitance in farads (F).
Provide the source voltage in volts (V) and time in seconds (s).
Select calculation type: Time Constant, Charge Voltage, or Discharge Voltage.
Click 'Calculate' to see results including time constant and capacitor voltage.
View detailed output in the results section with formulas explained.

Frequently Asked Questions

Find Quick Answers

What is the time constant in an RC circuit?

The time constant (τ) is the product of resistance (R) and capacitance (C), representing the time it takes for the capacitor to charge to about 63.2% of the source voltage or discharge to 36.8% of its initial voltage.

How do I calculate capacitor voltage during charging?

Use the formula Vc = V * (1 - e^(-t/τ)), where V is source voltage, t is time, and τ is the time constant (R*C). This gives the voltage across the capacitor at any time during charging.

Can this tool handle different units?

Currently, inputs must be in base SI units: ohms for resistance, farads for capacitance, volts for voltage, and seconds for time. For practical values, use prefixes like microfarads (μF) converted to farads (e.g., 10μF = 0.00001F).

Is this calculator accurate for real-world circuits?

Yes, it uses standard RC circuit formulas assuming ideal components. For real circuits, consider factors like internal resistance, leakage, or non-ideal behavior that might affect results.

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