VerElect — Electrical Engineer

VerElect is an electrical engineering calculator for field work, design checks, and learning. Explore circuit fundamentals, power systems, and solar PV with built-in NEC 2023, IEC 60364, and BS 7671 reference tables. CIRCUITS & AC POWER Calculate voltage, current, resistance, and power with Ohm's Law. Combine series and parallel resistors, analyze RLC impedance and resonance, and convert star-delta networks. Work with power triangles, power factor correction, single-phase and three-phase power, and kVA sizing. WIRE & CABLE Check voltage drop, select wire sizes by standard, and apply temperature and conduit-fill derating. Calculate conduit fill, cable resistance, and conductor weight for copper and aluminum. MOTORS & TRANSFORMERS Look up motor full-load current from NEC tables. Estimate starting current, torque, synchronous speed, slip, and efficiency. Size transformers and calculate impedance, short-circuit contribution, voltage regulation, efficiency, and turns ratio. PROTECTION & LIGHTING Estimate available fault current, breaker size, ground-rod resistance, and equipment grounding conductor size. Arc-flash calculations provide screening estimates with stated assumptions. Plan lighting with the lumen method, room cavity ratio, lux-lumen conversion, and connected load. POWER QUALITY Calculate total harmonic distortion, transformer K-factor, crest factor, tuned LC filters, and harmonic derating. IEEE 519 reference values provide context; they do not replace a complete compliance assessment. SOLAR PV - Panel sizing with tilt, shading, and temperature effects - PV cell/module Pmax, fill factor, and conversion efficiency - Operating power at site irradiance and cell temperature - Inverter sizing and DC/AC ratio - Battery capacity, discharge limits, and autonomy - Payback period and lifetime savings - Series-parallel strings checked against voltage and current limits ELECTRONICS & REFERENCE Calculate LED resistors, battery runtime, voltage dividers, resistor color codes, and energy costs. Convert units and search electrical formulas. BUILT FOR EVERYDAY USE - Parameter guidance with ranges or worked examples - Calculator guides with formulas and example problems - Calculation history, favorites, and quick tool switching - Copy, share, and export results to PDF - SI and Imperial display options - Layouts for iPhone and iPad - Available in 14 languages - Works offline, with no account required Pay once. No subscriptions, advertising, or in-app purchases. VerElect is a reference and educational tool. Always verify results against applicable codes, standards, and local regulations. It does not replace professional engineering judgment. Consult a licensed electrician or engineer for critical installations. References include NEC 2023 (NFPA 70), IEC 60364-5-52, and BS 7671:2018. Each tool identifies its formulas, assumptions, and applicable references.