Study notes
Notes that explain, not just list
Every topic in short sections: what it is, why it matters and when you'll use it, with flash cards to test yourself.
For UK electrical students, apprentices and electricians.
Study notes, practice questions, mock exams and circuit-testing sims for 2365 Level 2 and 3, 2366, ECS, Job Ready and Low Carbon. All in one place, on your phone.
14 days free, then £6.49 a month or £57 a year. Cancel any time.
Everything in one app
Read it, see it working, then test yourself.
Interactive visualisations
Visualisations you can play with
Move the sliders, take the readings, put a fault in. See the theory happen instead of reading about it.
Questions and mock exams
Practise until it sticks
Questions by topic with hints and the reason for every answer, then mock exams laid out like the real thing.
How the questions work
Every wrong answer teaches you something.
Hundreds of questions for 2365 Level 2 and 3, 2366 and the ECS test, sorted by topic and sub-topic. Your score for each topic builds as you go, so you can see what still needs work.
- 1AnswerPick your answer. Stuck? Ask for a hint first.
- 2See whyRight or wrong, the reason is shown straight away.
- 3Revise thisGot it wrong? One tap takes you to the notes that cover it.
- 4Sit the mockThe real number of questions, time and pass mark.
Interactive visualisations
The hard topics, made visible.
Over 25 visualisations you can move and test, built into the study notes. Each one has its working shown and a “try it” question to check you’ve got it.
- Reactance and resonance (R–L–C)
- Three-phase star and delta
- Ring final continuity
- Ohm's law and series/parallel
- AC waves and phase angle
- Motors and transformers
- Cable selection (Ib ≤ In ≤ Iz)
- Earthing systems and ADS
- Fault finding
- Solar PV
- Safe isolation
The courses
One sign-in for every course.
Pick what you’re working towards and it comes first.
City & Guilds 2365-02
Level 2 Diploma
Study notes, practice by topic and mock exams laid out like the real tests.
Find out more →City & Guilds 2365-03
Level 3 Diploma
Science, fault finding, inspection and testing, and design, with mock exams for every unit.
Find out more →City & Guilds 2366-03
Level 3 Electrotechnical (2366)
The Level 3 content arranged by 2366 units, plus organising work and finding your way around BS 7671.
Find out more →Site card
ECS Health, Safety & Environmental
Revision questions across every topic, plus full mock tests against the clock.
Find out more →On-site skills
Job Ready
Know the kit, read the drawings and understand the paperwork, domestic and commercial.
Find out more →Low carbon skills
Job Ready: Low Carbon
Solar, batteries, heat pumps and EV charging, from home to fleet depot.
Find out more →Practical skills
Circuit-testing sims
Safe isolation and testing on a virtual kitchen radial, with a real consumer unit and tester.
Find out more →Practical skills · new
Practise safe isolation on screen.
A virtual kitchen radial with a real consumer unit and tester. Learn it step by step, practise it, then sit a timed assessment marked Pass, Merit or Distinction. More sims are on the way.
About the sims →
Made by electricians
Written by people who do the job.
ProBits is built by qualified, working UK electricians. It explains things the way you'd explain them on site: what it is, why it matters and when you'll use it. Technical content is checked by a competent person, and anything not yet checked is clearly marked.
About usStart learning today
14 days free. Sign up with your email in a minute. Works on your phone, tablet and computer.