A structured revision walkthrough of every topic in City & Guilds 5393-03 Unit 103 (Electrical scientific principles and technologies for work in dwellings). Use it as a personal study checklist — work through each topic, tick off the points you can confidently explain or calculate, and use the linked Elec-Mate tools to practice the calculation-led parts. Designed for apprentices working primarily in domestic environments.
Free for 7 days · No charge until day 8 · Cancel anytime · Used by 1,000+ UK electricians
Written and reviewed by Andrew Moore, founder of Elec-Mate, against BS 7671:2018+A4:2026, IET Guidance Note 3 and the IET On-Site Guide.
1,000+
UK electricians
“Replaced three separate apps with Elec-Mate. Certs, quotes, and scheduling all in one place.”
Daniel Palmer — DP Electrical
In this section you should be confident with the following points. Each one is a specific topic you should be able to explain, demonstrate, or calculate.
Every key change in the 2026 amendment on one page. AFDDs, TN-C-S protection, new schedule columns, model forms. Pinned on your van dash.
In this section you should be confident with the following points. Each one is a specific topic you should be able to explain, demonstrate, or calculate.
In this section you should be confident with the following points. Each one is a specific topic you should be able to explain, demonstrate, or calculate.
In this section you should be confident with the following points. Each one is a specific topic you should be able to explain, demonstrate, or calculate.
In this section you should be confident with the following points. Each one is a specific topic you should be able to explain, demonstrate, or calculate.
In this section you should be confident with the following points. Each one is a specific topic you should be able to explain, demonstrate, or calculate.
AI-generated mocks, instant marking, and explanations on every question — targeted at your weakest topics. From £6.99/mo.
Start practising free
In this section you should be confident with the following points. Each one is a specific topic you should be able to explain, demonstrate, or calculate.
In this section you should be confident with the following points. Each one is a specific topic you should be able to explain, demonstrate, or calculate.
In this section you should be confident with the following points. Each one is a specific topic you should be able to explain, demonstrate, or calculate.
In this section you should be confident with the following points. Each one is a specific topic you should be able to explain, demonstrate, or calculate.
Elec-Mate’s apprentice tier turns this unit checklist into an active study plan. You get mock exam questions, flashcards, and revision notes mapped to this unit, plus working calculators for every calculation-led topic. Most apprentices use the app between college blocks and on the train to site — short bursts of revision compound across the year.
The Elec-Mate apprentice tier includes mock exams, flashcards, and revision notes for City & Guilds 5393-03 Unit 103 plus every other unit in your qualification. 7-day free trial — see your progress on the tutor dashboard.
A repeatable approach that works for City & Guilds 5393-03 Unit 103 and every other unit in your qualification.
Start at Topic 1 and read every bullet point. Don’t try to memorise — just get familiar with the scope. Note any topic that feels unfamiliar so you can come back to it.
For calculation-led topics, open the relevant Elec-Mate calculator and try one worked example. For theory-led topics, find the matching section in BS 7671 or the IET On-Site Guide.
The Elec-Mate apprentice tier includes mock questions mapped to this unit. Aim for 80%+ on a clean run before the real exam.
For practical units (inspection and testing, installation), ask your tutor for additional workshop access. The bench is where the points click.
If you can explain a topic in your own words to another apprentice and they understand it, you know it. This is the single highest-leverage revision tactic.
Verified reviews from the UK App Store.
Elec-Mate is my go to app for business and electrical work. It's feature rich without feeling cluttered. A true all in one app for quotes, certs, calculations, RAMS, EICRs, and more. I use it every day without fail, and it makes my workflow much smoother since I'm not jumping between apps anymore. The price-to-feature ratio is excellent. Any issues I've had, the developer responds within the hour and usually fixes them the same day. 100% recommend.
I've used the app and the web based version for a while now and it's well worth the investment. If you're an apprentice or experienced Spark give it a go, you won't be disappointed.
I've been using Elec-Mate for a while now, and honestly, it's one of the best apps I've ever downloaded. Every aspect of it feels thoughtfully designed, from the clean and intuitive interface to the powerful features that make everything so easy to manage. It's clear that a lot of care and attention went into building this app, and it shows in every detail.
Real feedback from real sparks
“Replaced three separate apps with Elec-Mate. Certs, quotes, and scheduling all in one place.”
Daniel Palmer
Sole Trader · DP Electrical
“I've won two contracts this month because I could turn quotes around same-day with the AI cost engineer.”
Nathan Perry
Electrician · NP Electrical Services
“The study centre got me through my AM2. Mock exams and flashcards are brilliant.”
Jake Pizey
3rd Year Apprentice · Apprentice
Join 1,000+ UK apprentices using Elec-Mate for mock exams, flashcards and revision notes mapped to every unit. 7-day free trial — see your progress on the tutor dashboard.
“Replaced three separate apps with Elec-Mate. Certs, quotes, and scheduling all in one place.”
Daniel Palmer, DP Electrical
From £6.99/mo after trial — less than a coffee a week
We use cookies to improve the app and measure what works. Cookie Policy