Pass the journeyman electrician exam
Practice 1,000+ questions on the 2023 NEC, take timed mock exams and use seven field calculators. Start with 20 free questions.
1,000+Questions
Timed mock exams 7 field tools
- Voltage drop
- Ohm's law
- Conduit offset
- Conduit bending
- Transformer current
- Power factor
- Series and parallel
Try a question
Every question has a full explanation and the NEC section to look up. Calculation questions show every step.
Everything you need to get exam-ready







Study guides and free tools
Start with the practice test, then work through the guides. The calculators use the same math as the app.
Seven calculators for the exam and the job site
Voltage dropFree on the web
Drop, percent and the wire size that fixes it.
Ohm's lawFree on the web
Volts, amps, ohms and watts from any two.
Conduit offset
Bend spacing and shrink for any offset.
Conduit bending
3- and 4-point saddles, kicks and rolling offsets.
Transformer current
Primary and secondary amps, or kVA from amps.
Power factor
kW, kVA, kVAR and power factor.
Series and parallel
Total resistance for up to 8 resistors.
Questions about the app
Is the app free?
Yes, to start. Twenty practice questions and the voltage drop and Ohm's law calculators are free. Pro unlocks every question, timed mock exams, all seven calculators and Explain it simpler, as a monthly or yearly subscription or a one-time purchase.
Which NEC edition does it cover?
The 2023 NEC. Support for the 2026 edition is coming. Some states, such as Texas, already test on the 2026 edition, so check your candidate bulletin.
Which devices does it work on?
iPhone and iPad running iOS 26 or later. Explain it simpler needs a device that supports Apple Intelligence.
Do I need an account or internet?
No account. Your progress stays on your device, and practice works offline.
Can I use it instead of the code book?
No. The app helps you practice and learn where answers are. On exam day you'll use the NEC itself, so study with your code book open.
When is it available?
It's coming soon to the App Store. The free practice test on this site uses the same 20 questions the app gives you free.
Study 20 minutes a day. Walk in ready.
Practice on your iPhone or iPad with questions written to the 2023 NEC.