Step-by-step walkthrough
Use this companion guide beside the interactive calculator to make sure you understand the “why” behind every click. Each section includes the classroom explanation, student-friendly language, and quick practice prompts.
Collect the data points listed below and double-check their units. Keeping an organized “givens” list is one of the fastest ways to reduce math errors and impress exam graders.
Step 1
Choose whether you're solving for Xc, XL, or the resonant frequency of a specific L and C.
Step 2
Enter capacitance in microfarads and/or inductance in millihenries, matching the mode you selected.
Step 3
For Xc or XL, also enter the operating frequency; skip it when solving for resonance.
Resistance dissipates energy as heat regardless of frequency. Reactance stores and releases energy (in an electric or magnetic field) and depends on frequency — at DC, capacitors act as an open circuit (infinite Xc) and inductors as a short (zero XL).
At resonance, an LC circuit's impedance is at a minimum (series) or maximum (parallel), which is the basis for tuning filters, oscillators, and radio receivers to a specific frequency.
