Pass your electrician licensing exam with confidence. VoltPrep is a complete, offline electrician exam prep app for apprentices, journeyman electricians, and master electricians studying for the licensing test.
Built around the National Electrical Code (NEC), VoltPrep turns exam-style questions, timed mock exams, and real field calculators into one focused study tool you can use anywhere — no Wi-Fi required.
⚡ 250+ PRACTICE QUESTIONS
Exam-style questions across 11 core topics: electrical theory, calculations, grounding and bonding, wiring methods, overcurrent protection, motors, transformers, services and feeders, safety, definitions, and special occupancies. Every question includes a full explanation and points you to the relevant NEC article.
📋 REALISTIC MOCK EXAMS
Test under real pressure with timed exams built to match the license you're chasing:
• Residential Wireman — 50 questions
• Journeyman Electrician — 80 questions
• Master Electrician — 100 questions
• Sprint Drill — a fast 25-question warm-up
Every exam ends with a pass/fail score and a topic-by-topic breakdown of exactly where you're strong and where you need work.
🎯 STUDY SMARTER, NOT LONGER
Spaced-repetition flashcards resurface the questions you miss until they stick. Drill a single weak topic, review only your missed questions, or take the daily challenge to keep your streak alive.
🧮 FIELD CALCULATORS BUILT IN
Nine calculators for the math the exam — and the job — actually demand:
• Voltage drop (single and three phase, copper and aluminum)
• Conduit fill
• Box fill
• Ampacity and conductor derating with OCPD sizing
• Motor circuit sizing
• Transformer sizing
• Dwelling service load
• Conduit offset bending
• Ohm's law and power
📘 STUDY GUIDE & FORMULA SHEET
12 plain-language lessons on the fundamentals every exam leans on, plus a searchable formula sheet that keeps the working equations one tap away.
📈 TRACK YOUR PROGRESS
Per-topic mastery meters, a study-streak calendar, full mock-exam history, and achievements show you're ready before test day.
📵 100% OFFLINE
Study on the job site, in the truck, or in a basement with no signal. No account, no sign-up, no internet needed.
✅ ONE-TIME UNLOCK — NO SUBSCRIPTION
Start free, then unlock the full question bank and unlimited mock exams with a single purchase. Buy it once, keep it for good. Pro also removes all ads.
WHO IT'S FOR
Apprentice electricians, journeyman and master electrician candidates, electrical trainees, and anyone preparing for a state or local electrician licensing exam or electrical certification.
Study anywhere. Walk in ready. Pass the first time.
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VoltPrep is an independent study aid and is not affiliated with, authorized by, or endorsed by the NFPA. NEC and National Electrical Code are registered trademarks of the National Fire Protection Association. Questions cite NEC article numbers for study guidance only and do not reproduce code text. VoltPrep is not a substitute for the current NEC.
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