TrueOhm vs Master Electrician Guide

TrueOhm is a fast, free electrical calculator built for electricians, apprentices, and engineers. Five powerful calculators in one app: • Ohm's Law Wheel — Enter any two of voltage, current, resistance, or power and instantly solve the other two. • AC Power — Calculate real power, apparent power, current, and voltage for single-phase and three-phase systems. • Power Triangle — Solve the relationship between kW, kVAR, kVA, power factor, and phase angle. • Energy Cost — Estimate energy consumption and cost for any load over any run time. • Efficiency — Calculate motor or system efficiency from input and output power. Every calculation shows its work — tap "How this was calculated" to see the exact formulas and substitutions used. Built-in sanity checks warn you about impossible values without blocking your workflow. Designed for the field. No ads. No subscriptions. Just fast, accurate calculations from 509 Electric.

Master Electrician Guide is the all-in-one toolkit for solo electricians and small operators - fast, focused, and built to work in the field (offline, except the AI assistant). CALCULATORS (NEC 2023, all offline) • Ohm's Law / power wheel • Voltage drop (% + minimum wire size) • Wire size with ambient + bundling derating and 110.14(C) terminal limits • Conduit fill (Chapter 9) and box fill (314.16) • Conduit bending offsets and shrink • Motor FLC, conductor and OCPD (Article 430) • OCPD sizing, transformer sizing, and dwelling load (Article 220) • Three-phase power (kVA/kW/amps), available fault current / AIC, series-parallel resistance, and an AWG / mm2 / kcmil converter CODE REFERENCE • Table 310.16 ampacities (copper & aluminum) • Conductor properties, conduit areas, grounding (250.66 / 250.122) • Wire color codes, NEMA configurations, residential circuits • Lug torque (110.14), burial depth (Table 300.5), and raceway/cable support • Choose your NEC edition (2017/2020/2023) — checklists & the AI adapt to it PER-STATE RULES • Adopted NEC edition, licensing authority, and license tiers for all 50 states + DC • The apprentice to journeyman to master career path FIELD DOCUMENTATION • Log jobs with client info and status • Attach before / during / after photos from your camera • Build professional line-item estimates AND invoices, exported as branded on-device PDFs with your company info • Back up and restore everything (jobs, photos, estimates, checklists) to a file • Run inspection-ready compliance checklists (service, rough-in, final, grounding & bonding, GFCI/AFCI, safety/LOTO, panel) with NEC references TROUBLESHOOTING & LEARNING • Diagnose 14 common field problems with ranked causes and safe steps • Plain-English lessons on the fundamentals, safety, and the business • Exam prep: 60 journeyman/master practice questions with explanations + NEC refs AI CODE ASSISTANT • Ask anything electrical and get code-aware answers that cite NEC sections • Snap a photo of a panel or device and get an AI diagnosis • Answers are aware of your selected state and NEC edition Master Electrician Guide is a field aid for qualified, licensed individuals. It is not a substitute for the adopted code, local amendments, or a licensed design. Always verify against your AHJ and adopted NEC edition, and follow NFPA 70E safety practices.