Press Run
The RC example opens ready to go: a 9 V battery, two switches, a resistor and a capacitor plotted on the scope.
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Free RC Circuit SimulatorWatch a capacitor charge and discharge.
Close the switch and a 100 µF capacitor charges through 10 kΩ with a time constant of one second; open it and close the other switch to discharge it.
Change R or C, try a square wave as a low-pass or high-pass filter, and read the curve on the scope.
Time constant on the scopeCharge & dischargeFilters too
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THREE SIMPLE STEPS
How to use the RC Circuit Simulator
Flip the switches
Close S1 to charge the capacitor through R1. Open it and close S2 to discharge it through R2.
Read the curve
After one time constant (R × C) the voltage has covered about 63 % of the way. Change R or C and compare.
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RC Circuit Simulator FAQ
What is an RC circuit?
A resistor and a capacitor together. The capacitor's voltage can't jump, so it moves towards the source voltage along an exponential curve set by the time constant τ = R × C.
How do I find the time constant?
Multiply the resistance by the capacitance: 10 kΩ × 100 µF = 1 s. On the scope, the charging curve reaches 63 % of the final voltage after one τ and over 99 % after five.
Can I simulate RC filters?
Yes. Open the RC low-pass or high-pass example from the Examples menu: a square wave goes in and the scope shows how the filter rounds the edges or passes only them.
Can I change the values?
Yes. Select the resistor or capacitor and type a new value with SI prefixes, such as 4.7k or 220u. The simulation keeps running with the new values.
Is it free?
Yes, with no sign-up and nothing to install. Everything runs in your browser, and you can save circuit files or share a link.
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Time constant on the scope · Charge & discharge · Filters too