# Electrician Handbook — Basics — Electric circuit, voltage, ohm

> Electrical engineering reference with theory, diagrams, calculators, and community. (iPhone/iPad app by Sergey Vavaev.)

- Source: https://appshunter.io/ios/app/electrician-handbook-basics/id1612996115 (this page in markdown: same URL + `.md`)
- Developer: [Sergey Vavaev](https://appshunter.io/developer/1612996327)
- Category: Reference, Education
- Price: Free with in-app purchases (on sale, was $5.99)
- Rating: 4.80/5 from 986 App Store ratings · 102 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.0 · 61 MB
- Languages: American English, Albanian, Arabic, Azerbaijani, Bulgarian, Croatian, Czech, Danish, Dutch, Estonian and 32 more
- Released: 2022-03-20
- Data updated: 2026-08-28
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/electrician-handbook-basics/id1612996115/reviews.md

## What is Electrician Handbook?

Electrician’s Handbook — an app for electricians, students, and installers.
Theory, diagrams, and calculators in one place.
Works offline. No ads. No subscriptions.

— Theory
A variety of topics in electrical engineering: from basic concepts to grounding and lighting diagrams. Some topics include exercises with answers for self-check.

— Diagrams
Interactive electrical diagrams. You can interact with elements to better understand how they work.

— Calculators
A section with calculators, formulas, and useful reference tables.

— Community
A section where users can ask questions, share experience, and get advice from other members.


— Contents of the "Theory" section:

Basic concepts
• Voltage, current, resistance, power
• Ohm’s Law, Kirchhoff’s rules
• Parallel and series connections
• Short circuits, safety precautions
• Electrical engineering terms

Electromechanical converters
• Transformer, generator, electric motor
• Connecting a three-phase motor using a capacitor

Protection and automation devices
• Circuit breaker, RCD, RCBO
• Voltage monitoring relay, contactor, fuses
• Surge protection devices

Cables and wires
• Wire connection methods
• Selecting cross-section by current and power
• Color coding
• Electrical panel

Power stations and substations
• Nuclear, thermal, solar, hydro, wind, and geothermal power stations

Measuring instruments
• Voltmeter, ammeter, ohmmeter, multimeter
• Clamp meter
• Electricity meter

Grounding
• Types of grounding systems
• Equipotential bonding system

Lighting
• Incandescent, LED, and other types of lamps
• Lamp holders, bases, lumens, lux
• Color temperature
• LED strip

Work execution
• Socket repair
• Installation of flush-mounted and surface-mounted sockets
• Switch installation

Additional information
• Power supply categories
• Surge overvoltages
• IP protection rating
• Electrician’s tools
• Types of outlets and plugs, voltages in different countries
• Joule’s Law, Coulomb’s Law
• Right-hand and left-hand rules


— Contents of the "Diagrams" section:

• Switch (1 and 2 gang)
• Three-gang switch
• Two-way switch
• Two-way switch with intermediate switch
• Outlets and switch in one block
• Lighting with dimmer
• Motion sensor lighting
• Relay with light sensor
• Lighting with impulse relay
• Fluorescent lamp wiring
• Socket wiring diagrams
• Magnetic starter for motor
• Star and delta motor connection


— Contents of the "Calculators" section:

• Basic formula calculator
• Electricity cost calculator
• SI unit system and metric prefixes
• Diameter ↔ cross-section table
• AWG to mm and mm to AWG conversion
• Electronic component symbols

## Key features

- Electrical theory topics
- Interactive circuit diagrams
- Calculators and formulas
- Community forum
- Offline access
- No ads or subscriptions

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove ads from application | $2.99 | one-time |
| Unlock all features in app | $7.99 | one-time |


## What do users think of Electrician Handbook?

Overall sentiment: positive

**Pros**

- 👍 Informative and useful
- 🚀 Comprehensive and interactive
- 💡 Helpful for beginners and professionals
- 🔍 Detailed diagrams and visuals
- 🤖 Intuitive and easy to use

**Cons**

- 🐛 Occasional crashes and bugs
- 💰 Ads can be intrusive
- 🕰️ Some content may be outdated
- 🌍 Limited language support

**Commonly reported bugs**

- App not launching on certain devices
- Calculation errors in some modules
- Inconsistent UI behavior across platforms

**Most requested features**

- More practical examples and tutorials
- Ability to save and export diagrams
- Inclusion of industry standards and regulations
- Integration of testing and simulation tools

## Recent user reviews (10 of 102)

All indexed reviews: https://appshunter.io/ios/app/electrician-handbook-basics/id1612996115/reviews.md

### 3/5 — Good but also not

*2026-06-26, version 4.0.5*

I’ve had this app before on a phone when it was just free and now I know it’s not completely then it is not as good would also be better if you have more access on the components not just parallel and series

### 2/5 — Incorrect electron flow

*2026-06-11, version 4.0.5*

Their diagram shows electrons flowing from positive to negative - THIS IS WRONG - electrons flow from negative to positive- Conventional current as is commonly understood flows positive to negative as this was how current was originally thought to flow before discovery of electron flowing- Really should make this clear otherwise it can throw doubt on the rest of the otherwise excellent info!

### 4/5 — No SEARCH option?

*2026-06-01, version 4.0.2*

Good helpful App but unless I’m missing something, would be even better with a ‘SEARCH’ function 👍

### 5/5 — Τέλειο

*2026-05-30*

Ό,τι πιο τέλειο υπάρχει μακάρι να το είχαμε την περίοδο των σχολικών μας χρόνων απλά γαμάτο συγχαρητήρια στον δημιουργό

### 5/5 — Incredibly Helpful

*2026-04-25, version 4.0.2*

I’ve been looking for something like this a long time, very informative and reviews a wide range of topics. Info is presented in an easy to understand format that even my ADHD can understand, without needing to check at least 3 different articles. I thank you developers so very much.

### 5/5 — Excelente

*2026-04-10, version 4.0.2*

Vale cada centavo!!

### 5/5 — 建议增加功能

*2026-04-08*

阅读时旁边有笔记调出就好了，不用隐藏

### 5/5 — vrungell

*2026-04-03*

Интерактивные схемы — это настоящая находка. Можно нажимать на элементы и сразу понимать, как они работают.

### 1/5 — Why hide safety behind paywall

*2026-04-02, version 4.0.2*

Of all the features to put behind a paywall, safety may be one of the worst choices. An app to reference and build confidence working with an energy source that can kill, but you have to pay to do so knowing how to do it safely.

### 5/5 — Feedback

*2026-03-23, version 4.0.2*

Wow the amount of information I get in app is amazing thank you the developers team.

## Frequently asked questions about Electrician Handbook

### What does the Electrician Handbook app do?

The Electrician Handbook app serves as a comprehensive reference for electricians, students, and installers. It provides access to electrical theory, interactive diagrams, practical calculators, and a community forum for users to ask questions and share experiences. The app is designed to be a valuable tool for learning and on-the-job reference.

### What kind of electrical theory is covered in the app?

The theory section covers a wide range of topics, from basic concepts like Ohm's Law and voltage to more advanced subjects such as grounding, lighting diagrams, and electromechanical converters. It includes explanations of electrical engineering terms, safety precautions, and details on various electrical components and systems.

### Are there any costs or subscriptions associated with this app?

No, this app is completely free to use and does not have any ads or subscriptions. It is designed to be accessible to all users without any financial commitment or interruptions from advertisements.

### Can I use the app without an internet connection?

Yes, the app is fully functional offline. This means you can access all of its features, including the theory sections, diagrams, and calculators, even when you do not have an internet connection. This makes it ideal for use on job sites or in areas with limited connectivity.

### What are the benefits of the interactive diagrams?

The interactive electrical diagrams allow users to engage directly with circuit elements to better understand how they function. This hands-on approach can significantly improve comprehension of complex electrical systems and wiring configurations, making it a powerful learning tool.

## Version history (last 5 releases)

### 4.0.5 — 2026-06-03

- Fixed some errors in the article text

### 4.0.2 — 2026-03-10

- Added ability to change language in settings
- Added quick result copying in calculators

### 3.4.1 — 2026-01-05

Minor visual fix

### 3.4.0 — 2025-12-17

Added the “Electrical Panel Designer” tab

### 3.3.9 — 2025-12-12

Added voltage drop calculator
Added resistor color code calculator

## More apps by Sergey Vavaev

- [Computer Basics: PC Guide](https://appshunter.io/ios/app/computer-basics-pc-guide/id6749609393)
- [Electrical Panel Designer](https://appshunter.io/ios/app/electrical-panel-designer/id6755904617)

All apps by Sergey Vavaev: https://appshunter.io/developer/1612996327

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-28.*