Electrician Theory for Apprentices
Ghost voltage, harmonics, kW vs kVA — the questions working electricians ask.
- Trades
- Intermediate
- English
- 12 videos · 4.5 h
- Updated Jun 2026
Videos by Electrician U · 41.3K views on this playlist
About this course
Practical theory from Electrician U for apprentices and working electricians. It covers testing for ghost voltage, why non-contact testers can mislead, harmonics, kW vs kVA, why loose connections start fires, and the maths behind Ohm's law.
What you'll be able to do
- 1Test safely and recognise ghost voltage
- 2Explain kW vs kVA and harmonics
- 3Use Ohm's law on real jobs
Videos
Start with video 1 →MODULE 1Videos 1–66 lessons · 89 min
- Ghost Voltage and How Electricians Test It?11 min
- Would You Trust Your Life With a Tic-Tracer?19 min
- Voltage vs Amperage vs Wattage vs Ohmage?18 min
- Does More Current Mean Faster Electrons or More Electrons?9 min
- The Real Reason Your Dimmable Lights Buzz or Flicker19 min
- How Do Electrical Harmonics Work?13 min
MODULE 2Videos 7–126 lessons · 177 min
- Why KW and KVA Are NOT The Same Thing (Even If They Seem Like It)13 min
- Can AC and DC Flow Together on the SAME Wire?!10 min
- Why Loose Wires Cause Fires: Why I Pre-Twist.17 min
- Stop Struggling with Electrical Math – Ohm’s Law Made Simple!56 min
- This Simple Formula Mistake is Making You Sound Wrong! (Fix It Now)7 min
- 📐 Learn to Read Blueprints Like a Pro – Live & Interactive74 min
Printable cheat sheet: outcomes and the video checklist
These are the first 12 of 50 videos. Continue the full playlist on YouTube
- Before you start
- Basic electricity (try “Electricity Basics, Explained Visually” first)
- Accessibility
- YouTube captions where the creator provides them · Keyboard-accessible player · Notes and bookmarks
Where these videos come from
Every lesson plays the original video from Electrician U with YouTube's own player, so views and credit stay with the creator. We picked this playlist because it's complete, in order, and recently updated. SkillSpring adds progress tracking, notes, bookmarks and focus mode around it.
Playlist: “Theory” · 50 videos · last updated Jun 2026. Open on YouTube