Free Electrician Practice Test (20 Questions)
20 free journeyman electrician questions mixed from every part of the exam, based on the 2023 NEC.
Free practice tests
Journeyman Electrician Practice Test (Free)
15 free journeyman electrician questions mixed from every part of the exam, with every answer explained.
Free Ohm's Law Practice Problems for Electricians
15 free problems on Ohm's law, Watt's law, series and parallel circuits, and the electrical math on the journeyman exam.
NEC Code Practice Test (Free, 2023 NEC)
15 free questions on how the NEC is organized, finding the right article fast, working clearances, labeling, and safety.
Electrical Load Calculation Practice Test (Free)
15 free questions on standard and optional load calculations, branch circuit calcs, and feeders.
GFCI and AFCI Practice Test (Free, 2023 NEC)
15 free questions on GFCI and AFCI requirements under the 2023 NEC, including the kitchen and dwelling unit changes.
Free Grounding and Bonding Practice Test
15 free questions on grounding electrode systems, GEC and EGC sizing, bonding jumpers, and neutral-ground separation at subpanels.
Conductor Ampacity Practice Test (Free)
15 free questions on reading ampacity tables, derating and temperature correction, and conductor insulation types.
Motors and Transformers Practice Test (Free)
15 free questions on motor full-load current, motor branch circuits and protection, controls and disconnects, and transformers.
Box Fill and Conduit Fill Practice Test (Free)
15 free problems on box fill calculations, conduit fill with the Chapter 9 tables, and conduit bending basics.
Study guides
Kitchen GFCI Requirements (NEC Guide)
The kitchen has more GFCI requirements than almost any other room in the house. Here is which outlets need protection, how the 6 foot sink rule works, and what changed with the 2020 NEC.
Does a Dishwasher Need GFCI Protection?
The answer used to be no. That changed with the 2020 NEC and a lot of electricians still do not know it. Here is what the current code requires and how to wire it correctly.
AFCI Requirements Explained
AFCI requirements have expanded a lot over the last few NEC cycles. Here is which rooms need arc fault protection, how AFCI breakers and outlet devices work, and what the current NEC says.
Conduit Spacing Chart Explained
How far apart do conduit supports need to be? It depends on the type of conduit and the size. Here is a breakdown of the NEC support spacing requirements for EMT, RMC, and PVC.
What Is a Dead Front Electrical Panel?
Dead front gets thrown around on job sites all the time but not everyone knows exactly what it means. Here is the simple explanation, why the NEC requires it, and what it looks like in real life.
Electrical Burial Depth Requirements (NEC Table 300.5)
How deep does underground wire actually need to go? The answer depends on what you are burying and where. Here is a practical breakdown of the NEC burial depth requirements for common wiring methods.
NEC Table 300.5 Explained (Burial Depths)
How deep does underground wire need to be buried? It depends on the wiring method and where it is. Here is how to read NEC Table 300.5 and the numbers you need to know for the exam.
What Is an Isolated Ground?
That orange triangle on a receptacle means something. Here is what an isolated ground actually is, how it is wired, and why sensitive equipment needs its own dedicated ground path.
Grounding Electrode Conductor Size (NEC Guide)
Sizing the GEC trips up a lot of people on the exam. Here is how to use NEC Table 250.66, what changes when you are running to a ground rod, and the sizing cap you need to know.
NEC Voltage Drop Rule Explained (3% vs 5%)
The NEC has two voltage drop numbers every electrician needs to know. Here is what 3% and 5% mean, where each one applies, and why it matters on long wire runs.
Romex in Conduit: Is It Allowed?
Can you run Romex in conduit? This guide explains when NM cable is allowed in conduit, when electricians use it for protection, and the NEC rules behind it.
Minimum Circuit Ampacity Explained
Confused about minimum circuit ampacity? This guide explains what MCA means, how electricians size conductors from it, and how it differs from breaker size.
Voltage Drop Calculation Explained for Electricians
Need help understanding voltage drop calculation? This guide explains the formula electricians use, why voltage drop happens, and how to solve exam-style problems step by step.
Ampacity of 12 THHN Wire
What is the ampacity of #12 THHN wire? This guide explains the NEC ampacity rating, why the table says 30 amps, and why electricians usually use it on 20 amp circuits.
GFCI Requirements Explained (NEC 210.8)
Not sure where GFCI protection is required? This guide explains NEC 210.8 in plain English and walks through the most common locations electricians see on the job and on exams.
Ampacity Table 310.16 Explained
Confused by NEC Table 310.16? This guide breaks down how electricians actually read the ampacity table, what the temperature columns mean, and how to size conductors correctly.
Arc Fault vs GFCI (What's the Difference?)
Confused about arc fault vs GFCI protection? This guide explains the difference in plain English, when electricians use each one, and why many circuits now require both.
How to Calculate Voltage Drop Step-by-Step
Need help figuring out voltage drop without getting lost in the formula? This guide walks through how to calculate voltage drop step by step with a simple example and the mistakes exams love to test.
EMT vs Rigid Conduit (Key Differences)
Confused about EMT vs rigid conduit? This guide explains the key differences, when electricians use each type, and why rigid conduit is much tougher than EMT.
Grounded Conductor vs Grounding Conductor
Confused about neutral vs ground? This guide breaks down grounded conductor vs grounding conductor in plain English, including what each one does, where they connect, and the mistakes exams love to test.
Main Bonding Jumper Explained
Confused about where the main bonding jumper goes and what it actually does? This guide breaks down the service bond, main panel vs subpanel, and the simple way to think about neutral and ground.
Voltage Drop Calculator for Electricians
Trying to figure out voltage drop without getting lost in formulas? This guide explains how a voltage drop calculator works, what affects the numbers, and why long runs can change your wire size choice.
Voltage Drop Formula Explained (With Examples)
Confused by the voltage drop formula? This guide breaks it down in plain English with examples so you understand how wire length, current, and conductor size affect voltage loss.
Breaker Size Chart (Complete Guide)
Need a quick way to remember common breaker and wire pairings? This breaker size chart breaks down the basics in plain English, including common sizes, continuous loads, and where people mess up on exams.
Voltage Drop Chart for Electricians
Long wire runs cause voltage loss because of conductor resistance. This simple voltage drop chart explains how electricians estimate voltage drop and when to increase wire size.
Wire Size Chart (AWG Chart Explained)
AWG wire sizes can look confusing at first because the numbers run backwards. Here is a simple explanation of the wire size chart and the sizes electricians memorize.
Grounding vs Bonding (Key Differences)
Grounding and bonding sound similar but they solve different problems. Here is the simple way electricians remember the difference and why it matters for safety and exams.
Ampacity Chart for Copper and Aluminum Wire
Copper and aluminum do not carry the same amps, and the temp rating matters. Here is a simple chart plus the quick rules so you do not pick the wrong size.
Conduit Fill Chart (NEC Guide + Calculator)
A simple way to figure out conduit fill using NEC Chapter 9 tables. Learn how many wires fit in EMT and how to calculate it without getting lost in the code book.
Wire Size for a 100 Amp Sub Panel
The real answer depends on copper vs aluminum, THHN vs SER, and how far the run is. Here is the simple way to pick it without guessing.
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