Free for electrical apprentices and journeymen
Learn the electrical trade, one year at a time
Wiring diagrams you can switch and trace, a motor-control course you can run, drills that mark you on the spot, and tools that work in imperial or metric. Written plainly, from the trade — and never a substitute for your code book or your journeyman.
Search lessons, diagrams and tools… /Where are you?
- First-year apprentice Just started, or in first-period school 37 pages
- Second-year apprentice Past the basics, into commercial work 31 pages
- Third year Motors, three-phase and controls 29 pages
- Fourth year Getting ready for the exam 18 pages
- Journeyman refresher Ticketed — refreshing, or teaching 18 pages
Brand new, first week? Start here — the apprentice path takes you through it in order.
Las que más usa
Organise my tools — pin, order, hide, make lists
Herramientas populares
All 36 tools →- 3rd yearThree-phase
Calculadora de potencia trifásica
kW, kVA, kVAR and amps from any one of them, with voltage and power factor — three-phase or single.
- 3rd yearTransformers
Transformador: corriente a plena carga y relación
Primary and secondary full-load amps, line and turns ratio, and the current in each winding for delta or wye.
- 3rd yearMotors
Velocidad síncrona y deslizamiento de un motor
Synchronous speed from frequency and poles, the pole count a nameplate speed implies, slip and rotor frequency.
- 3rd yearThree-phase
Conversión de impedancia delta ↔ estrella
Turn a delta of three impedances into the equivalent wye, or back — balanced or not.
- 1st yearDrills
Práctica de la ley de Ohm
Solve for V, I, R or P at three levels, marked on the spot.
- 1st yearDrills
Prueba de cinta métrica
Read a tape to the nearest 1/16", timed or free practice.
Interactive wiring diagrams
All diagrams →Drawn from the circuit up, so the interactive layer is the real thing — flip a switch and the light responds for the right reason.
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Interruptor de 3 vías
Two switches, one light — toggle each and trace the travellers.
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GFCI
Trip it and watch the load die while the line stays hot.
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Interruptor de 4 vías
Three switch points: what the 4-way does to the travellers.
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Serie contra paralelo
Pull a lamp from each and see the difference.
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Vivo, neutro, tierra
Three conductors by the job each does. Press the fault.
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Arranque/paro de un motor
The three-wire station and its seal-in, running.
Read this tape
The one skill every first day assumes. Read it to the nearest sixteenth and keep a streak going — then try the other drills: Ohm’s law, series and parallel, fractions, conversions and offsets.
The motor control course
Twelve lessons from reading a ladder diagram to finding a hidden fault with a meter — every circuit runs in the page. Start the course.
Look it up
The glossary, symbols, printable formula sheets and the on-the-job basics are all under Reference. No code-book tables are reproduced anywhere: where a value comes from the code, you type it from your own copy.
En esta visita
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Guardar estos resultados
Enviamos este único correo a través de nuestro proveedor de correo y no guardamos su dirección a menos que marque la casilla.
Enviamos este único correo a través de nuestro proveedor de correo y no guardamos su dirección.
Este ejercicio necesita JavaScript para generar y calificar las preguntas. Actívelo para practicar — la explicación de abajo sirve de todos modos.
At the bender? bentright.com does conduit offsets and saddles. Doing a take-off? fieldcalc.net does the material numbers.
Avisos de herramientas que le sirven — por correo, opcional
Deje su correo y marque la casilla para recibir un aviso breve, como máximo cada dos semanas, sobre herramientas, ejercicios y diagramas que encajan con lo que ha estado estudiando — aquí y en bentright.com y fieldcalc.net. Es la misma lista para los tres, se sale con un clic y no se envía nada hasta que confirme desde su bandeja de entrada.