
Principles of Electrical Science
Revision support for formulas, AC theory, motors, transformers, lighting calculations and worked examples.
- 60 practice questions
- 25+ worked calculations
- Full formula sheet
- Pass / Merit / Distinction strategy
Level 3 electrical revision guides, practice questions, worked explanations, quick reference cards and study plans — built to help apprentices revise with more structure.
Built by an apprentice, for apprentices.




You've sat through the lessons. You've read the notes. But when you try a practice paper, the answers all sound similar and it is hard to know why you got it wrong.
CircuitReady is built to make revision clearer. Each guide breaks the unit into focused sections, gives you practice questions, explains the answers and helps you revise with a simple 7-day plan.
CircuitReady is being built as a practical revision system for electrical apprentices. Right now, you can get the Level 3 unit guides, free question taster and 4-guide bundle. Over time, the system may expand into quick test sheets, exam-ready checklists, progress trackers, fault-finding workflow packs and CircuitReady Pro.
Not yet available. Ideas being explored as CircuitReady grows.
Download the free revision taster and test yourself on 10 tricky questions Level 3 students commonly get wrong.
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Pick the exam you are sitting next, or get all 4 available guides together in the bundle.

Revision support for formulas, AC theory, motors, transformers, lighting calculations and worked examples.

Revision support for fault symptoms, testing logic, rectification steps and scenario-style questions.

Revision support for safe isolation, test sequence, RCDs, Zs, insulation resistance, PFC and documentation.

Revision support for cable selection, protective devices, design logic and On-Site Guide lookup speed.
Get all 4 currently available CircuitReady Level 3 revision guides together.
A measured Zs of 1.2Ω is obtained. The tabulated maximum is 1.37Ω. Applying the 80% rule, is this acceptable?
This is the kind of detail that catches students out. CircuitReady guides explain the answer, not just whether you were right or wrong.
CircuitReady was built while studying for Level 3 electrical exams. The aim is simple: make revision clearer, more structured and easier to follow.
If the launch goes well, CircuitReady may expand into Unit 301, Level 2 Electrical Installation, 18th Edition, 2391, quick test sheets, fault-finding workflow packs, three-phase basics and progress trackers.

CircuitReady Pro is a future revision tool idea designed to help apprentices spot weak areas, revise with more focus and track progress. The PDF guides are available now.
No. CircuitReady is an independent revision aid. It is not affiliated with or endorsed by any awarding body.