Electrical
Electrical theory and calculators: impedance, AC power and three-phase circuits.
5 entries- Tool
Balanced Three-Phase Power Calculator
Calculate apparent, real, and reactive power from line voltage, line current, and power factor in an ideal balanced three-phase system.
- Tool
LED resistor calculator
Pick the series resistor for an LED from your supply and datasheet, with the nearest E24 value, real current, resistor watts, and what to check with a meter.
- Guide
Ohm's law: how voltage, current and resistance relate
What Ohm's law says, why V = IR works for a resistor and not an LED, and how to use it on a real circuit, with a live one-circuit explainer.
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Series RLC Circuit Analyzer
Calculate complex impedance, phase angle, RMS current, and AC power for an ideal series RLC circuit while keeping the formulas visible.
- Guide
What is impedance? How AC circuits oppose current
Impedance is how a circuit opposes alternating current. See how resistance and reactance combine, why current lags or leads, and how Z = V/I extends Ohm's law.