Electrician Handbook — Basics4.0.5 - App Store

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

Version History - Fixed some errors in the article text 4.0.5 Jun 3 - Added ability to change language in settings
- Added quick result copying in calculators 4.0.2 Mar 10 Minor visual fix 3.4.1 Jan 5 Added the “Electrical Panel Designer” tab 3.4.0 12/17/2025 Added voltage drop calculator
Added resistor color code calculator 3.3.9 12/12/2025 bug fix 3.3.6 11/18/2025 Added reading progress bar 3.3.5 08/20/2025 Minor fixes 3.3.4 07/19/2025 Minor improvements and fixes 3.3.3 07/14/2025 — Added navigation buttons between articles 3.3.2 07/02/2025 Minimal fixes 3.3.1 06/22/2025 Community tab added. Ask questions and share your experience 3.3.0 06/17/2025 — Minor fixes
— Added mention of millivolt, kilovolt, and megavolt in the article about electric voltage 3.2.3 06/12/2025 — Minor bug fixes
— iPad version added 3.2.2 06/11/2025 — Minor bug fixes 3.2.1 06/06/2025 Advertising has been completely removed from the app. 3.2.0 06/05/2025 Fix for a bug in the "Electronic Components" section that caused the app to crash. 3.1.3 06/03/2025 • Fixed issue with opening theory articles
• New main menu design 3.1.2 05/20/2025 — We've refreshed all articles from top to bottom!
— Enjoy newly improved translations that read naturally and clearly.
— Tons of new practical content has been added for even more value.
— Dive in and see what’s new — the updated material is ready for you! 3.0.3 04/23/2025 Bug fixes 2.9 11/08/2024 Bug fixes 2.8 11/03/2024 Bug fixes 2.7 09/08/2024 Bug fixes 2.6 12/15/2023 Minor bug fixes 2.5 12/12/2023 Bug fixes 2.3 06/04/2023