RLC Circuit Differential Equation Solver: Step-by-Step Solutions

Charge and current in a series RLC circuit, transient and steady state. Every step of the solution is shown, as you would write it on paper, using exact fractions.

What it solves

Kirchhoff's voltage law gives $L{q}^{\prime \prime }+R{q}^{\prime }+\frac{1}{C}q=E_0\cos \omega t$ for the charge $q$ on the capacitor ($\omega =0$: constant voltage $E_0$). The current is $i=q^{\prime }$.

How to use it

1. Enter your own numbers or functions in the boxes (an example is already filled in, or press Random example).
2. Check the equation preview, then press Solve step by step.
3. Reveal the solution one step at a time with Next step, or show everything at once.

Need the theory first? Read Section 5.6: Electric Circuits, which explains the method in small steps with worked examples and exercises, then come back and test yourself with the Chapter 5 quiz.

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