AC Power Calculator
Enter your circuit parameters and get power factor, apparent power, reactive power, and phase angle — with a live power-triangle diagram and the formulas behind every result.
How voltage fluctuations, overloads, and poor wiring damage appliances. Practical steps to protect equipment at home and reduce the risk of electrical faults.
Jun 18, 2026GuidesLearn how to measure power factor with a clamp meter, including single and three-phase methods, a worked example, and safety guidance.
Jun 15, 2026GuidesHow welding machines affect power factor, why transformer welders have low swinging PF, and how to size circuits and correction for reactive loads.
Jun 14, 2026GuidesLearn how detuned reactors protect capacitor banks from harmonic resonance, with tuning factor selection, worked examples, and other protection methods.
Jun 13, 2026GuidesHow power factor shapes UPS sizing, rack capacity, and energy bills in data centers — with a worked kW vs kVA example.
Jun 12, 2026GuidesFixed capacitor banks can push power factor leading at light load, raising voltage and triggering utility penalties. Here's what to watch for.
Jun 11, 2026GuidesA credible account of real electricity savings: which changes moved the needle on a monthly bill, which were overhyped, and what the numbers actually looked like.
Jun 10, 2026GuidesPower factor and efficiency sound similar but measure completely different things. Learn the real distinction and why it matters for your electricity bill.
Jun 10, 2026GuidesLearn how to calculate power factor from watts and VA using PF = W / VA, with worked examples for single-phase and three-phase systems.
Jun 9, 2026GuidesVFDs distort current waveforms and create harmonics that make standard capacitor banks dangerous. Learn why and how to mitigate it.
Jun 8, 2026GuidesLearn how APFC panels use a PF relay and switched capacitor stages to maintain target power factor automatically in industrial facilities.
Jun 7, 2026GuidesUnderstand cosine phi, phase angle φ, and how PF = cos φ connects the power triangle to real electrical calculations.
Jun 6, 2026GuidesHow solar PV inverters handle power factor, grid-code reactive power requirements, volt-VAR modes, and a worked example at 0.95 leading PF.
Jun 5, 2026GuidesCompare synchronous condensers and capacitor banks for reactive power compensation: cost, response speed, harmonic behavior, and which fits your application.
Jun 4, 2026GuidesA practical look at saving electricity at home and work: which changes have real impact, what renewable options cost today, and how to track your actual consumption.
Jun 3, 2026GuidesLearn why induction motors have poor power factor at light loads, how magnetizing current is the culprit, and what you can do about it.
Jun 3, 2026GuidesLearn how to calculate power factor in three-phase systems, with formulas for balanced and unbalanced loads, line vs phase quantities, and a worked example.
Jun 2, 2026GuidesLearn how to read analog and digital power factor meters, understand lag vs lead readings, and decide when correction is needed.
Jun 1, 2026GuidesDisplacement power factor measures the fundamental frequency phase angle. True power factor also accounts for harmonic distortion. Learn how THD links them.
May 30, 2026GuidesLearn the difference between kVA, kW, and kVAR, how they relate through the power triangle, and what each unit actually sizes in AC electrical systems.
May 28, 2026GuidesPractical guide to power factor correction: when to add capacitors, how to size them, why partially loaded motors hurt PF, and how utilities charge for low power factor.
May 27, 2026GuidesLearn how utilities calculate power factor penalty charges, kVA billing, and demand surcharges, with a worked example and bill comparison table.
May 26, 2026GuidesLearn what causes leading and lagging power factor, how inductive and capacitive loads affect phase angle, and why the difference matters for real systems.
May 24, 2026GuidesLearn how to size power factor correction capacitors using the kVAR formula Qc = P·(tan φ1 − tan φ2), with worked examples and a multiplier table.
May 22, 2026GuidesPower factor measures how efficiently your electrical system converts apparent power into useful work. Learn real vs reactive power, the power triangle, and why PF matters.
May 20, 2026