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Electrical Theory Calculators

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Choose one electrical theory calculator and work with it in a focused space. Every tool keeps its formulas, assumptions, units, and calculated values together so you can test a prediction instead of treating the result as a black box.

3 theory instrumentsCalculates in your browserFormulas stay visible
Z = R + j(XL − XC)

Series RLC circuit analyzer

Explore how resistance, inductance, and capacitance shape impedance, phase, current, and AC power.

5 inputs8 results

Open calculator
|S| = √3 VLL IL

Balanced three-phase power

Connect line-to-line voltage, line current, and power factor to apparent, real, and reactive power.

4 inputs4 results

Open calculator
R = (Vs − n·Vf) / I

LED resistor calculator

Start from a supply and an LED datasheet: standard resistor, real current and wattage, then DC wire-run drop and battery sag.

3 scenarios4 views

Open calculator

A useful way to work with a calculator

Section titled “A useful way to work with a calculator”
  1. Predict whether the result should be larger, smaller, leading, or lagging.
  2. Change one input and explain the new result in words.
  3. Sketch the related circuit, impedance triangle, or power triangle.
  4. Check the units and test a limiting case.
  5. Record any mismatch between your prediction and the model.

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