IBEW Apprenticeship Prep

Exam blueprint

Sourced from Electrical Training ALLIANCE (formerly NJATC) — Aptitude Test Bulletin + Inside Wireman Apprenticeship Standards

• Algebra + functions (linear, exponents, quadratics, formulas)30%
• Arithmetic, fractions, decimals, percentages, ratios15%
• Reading comprehension (technical passages + main idea)20%
• Basic electrical theory (Ohm's law, series/parallel, units)15%
• Hand tools, wire, conduit, basic materials5%
• Jobsite safety + lockout/tagout fundamentals5%
• Interview preparation + work history articulation10%

1. 01Aptitude test math — algebra + arithmetic

   ~240min

   The math section is the section most candidates fail. Linear equations, function notation, exponents, and word problems delivered with no calculator. Reps until automatic.

   • Fractions, decimals, percentages — the warm-up

     Before the algebra hits, the test eases in with fraction/decimal/percentage conversions and basic operations. Lock these in: to add or subtract fractions you need a common denominator (1/2 + 1/3 = 3/6 + 2/6 = 5/6); to multiply fractions you multiply numerators and denominators (2/3 x 3/4 = 6/12 = 1/2); to divide, invert and multiply (2/3 ÷ 1/4 = 2/3 x 4/1 = 8/3). Decimal-percentage: 0.25 = 25%, 0.4 = 40%, 0.075 = 7.5%. Word-problem percentages: "what is 15% of 80?" = 0.15 x 80 = 12. "12 is what percent of 80?" = 12/80 = 0.15 = 15%. "12 is 15% of what?" = 12/0.15 = 80. Practice the third form — it trips up candidates who can do the first two.

   • Linear equations — solving for x

     A linear equation has variables to the first power, like 3x + 5 = 20. Solve by isolating x: subtract 5 → 3x = 15 → divide by 3 → x = 5. Two-step word example: "A wire reel has 250 ft. After cutting four pieces of equal length, 50 ft remain. What is each cut length?" → 250 - 4L = 50 → 4L = 200 → L = 50 ft. Always: same operation on both sides. Watch sign flips when multiplying/dividing by a negative. The aptitude test mixes algebra into nearly every word problem — stay disciplined about writing the equation BEFORE solving.

     Reference: NJATC Tech Math Chapter 4 — Linear Equations

   • Exponents + scientific notation

     Exponent rules tested: x^a · x^b = x^(a+b) (3^2 · 3^4 = 3^6); (x^a)^b = x^(a·b) ((2^3)^2 = 2^6 = 64); x^0 = 1 for any non-zero x; x^(-a) = 1/x^a. Scientific notation: 4.5 x 10^3 = 4500; 2.0 x 10^-4 = 0.0002. Multiplication: (3 x 10^2)(4 x 10^3) = 12 x 10^5 = 1.2 x 10^6. The test favors scientific-notation problems because electricians work with everything from microamps (10^-6 A) to megohms (10^6 Ω). Memorize the milli/kilo/mega prefixes and their exponents — they appear on the math AND the electrical-fundamentals questions.

   • Function notation + reading-tables problems

     The test treats functions as input-output rules: f(x) = 2x + 3 means "given x, return 2x + 3". So f(4) = 11, f(-1) = 1. Some questions present a TABLE of x and y values and ask you to identify the rule (look for constant differences → linear; constant ratios → exponential). Distinguish a linear pattern (each step adds the same amount) from a quadratic pattern (the SECOND differences are constant). Watch for tables where the input column skips values — interpolate carefully. This is where careless candidates lose 1-2 points; methodical ones gain them back.

   Practice questions (3)

   1. 1. Solve for x: 4x − 7 = 17

      • A.4
      • B.5
      • C.6✓ correct
      • D.7

      Add 7 to both sides → 4x = 24 → divide by 4 → x = 6. The distractors come from common errors: 4 (forgetting to add 7), 5 (subtracting 7 instead of adding), and 7 (dividing 17/something incorrectly). Always reverse the operations in the right order.

   2. 2. Simplify: (2 × 10^3) × (3 × 10^4)

      • A.6 × 10^7✓ correct
      • B.5 × 10^7
      • C.6 × 10^12
      • D.6 × 10^4

      Multiply coefficients: 2 × 3 = 6. Add exponents (because both are powers of 10 being multiplied): 10^3 × 10^4 = 10^(3+4) = 10^7. Result: 6 × 10^7. The 5 × 10^7 distractor adds the coefficients instead of multiplying. 6 × 10^12 multiplies the exponents (wrong rule). 6 × 10^4 just keeps one of the exponents.

   3. 3. A cable is cut into pieces of 3 ft 6 in each. How many full pieces can be cut from a 28 ft length, with how much waste?

      • A.7 pieces, 3 ft 6 in waste
      • B.8 pieces, 0 in waste✓ correct
      • C.8 pieces, 4 in waste
      • D.7 pieces, 7 in waste

      3 ft 6 in = 3.5 ft. 28 / 3.5 = 8 exactly, with no remainder. The trap is "9 pieces" or "7 pieces with waste" — both common when candidates rush to long-divide instead of converting to a decimal first. Convert mixed-foot measurements to decimal feet (or all to inches) BEFORE dividing.

2. 02Reading comprehension — technical passages

   ~90min

   The reading section feeds you 200-400 word passages — many about electrical systems, codes, or trade history — and asks main-idea, detail, inference, and vocabulary-in-context questions. Strategy beats raw reading speed.

   • Read the questions first — then the passage

     On a timed test, reading the QUESTIONS before the passage tells you what to look for. You are not reading for pleasure — you are mining the passage for specific facts. Mark the question stems mentally: "main idea", "according to the passage", "the author implies", "the word X most nearly means". Each stem has its own strategy. For "main idea" questions, the answer is rarely in the first or last sentence verbatim — it captures the passage as a whole. For "according to" questions, the answer must be DIRECTLY supported by text — never inferred. Inference questions allow one logical step beyond text but never two.

   • How wrong answers are constructed

     Aptitude reading distractors are predictable. (1) The "almost right but too extreme" — uses words like "always", "never", "all", "none" when the passage says "often" or "most". (2) The "right concept, wrong direction" — flips a positive into a negative. (3) The "right answer to a different question" — true based on the passage, but doesn't answer this stem. (4) The "outside knowledge" — true in real life but not in the passage. The correct answer is usually the most CONSERVATIVELY WORDED option that is fully grounded in the text. When in doubt, eliminate extreme-language options first.

   • Vocabulary-in-context — substitution test

     When asked what a word "most nearly means," IGNORE the dictionary definition and look at how the word functions in the sentence. Try each answer choice in place of the original word and pick the one that preserves the sentence's meaning. Many test words have multiple definitions — "current" can mean "present-day" OR "flow of electricity"; "circuit" can mean "loop" OR "court district". Context disambiguates. Never pick a definition just because it sounds technical or sophisticated; pick the one that fits.

   Practice questions (1)

   1. 1. A passage states: "Although Edison championed direct current (DC) for early urban distribution, by the 1890s alternating current (AC) had decisively won the so-called War of Currents because of its ability to be efficiently stepped up to high voltages and stepped back down for end use." Per the passage, why did AC win?

      • A.Edison endorsed it after 1890
      • B.It is safer than DC at all voltages
      • C.It can be efficiently transformed up and down in voltage✓ correct
      • D.It is cheaper to generate

      The passage explicitly says "because of its ability to be efficiently stepped up to high voltages and stepped back down for end use" — that is voltage transformation, the answer in option C. A contradicts the passage (Edison championed DC). B introduces a safety claim the passage does not make. D introduces a cost claim the passage does not make. "According to the passage" answers must be DIRECTLY supported, not plausibly true.

3. 03Basic electrical theory — Ohm's law + circuits

   ~60min

   You will not be tested at the level of a journeyman, but the test (and the panel interview) appreciates candidates who understand what they are signing up for: voltage, current, resistance, and the difference between series and parallel.

   • Ohm's law — V = I × R

     Voltage (V, in volts) = Current (I, in amperes) × Resistance (R, in ohms). The same triangle gives you all three forms: I = V/R, R = V/I. Power follows: P (watts) = V × I; equivalently P = I²R = V²/R. A resistor with 12 V across it and 4 Ω resistance carries 3 A and dissipates 36 W. Memorize that an "ohm" is one volt per amp; a "watt" is one volt-amp. The wheel diagram (V, I, R, P with all six derivations) is worth memorizing — it appears as a memory aid in nearly every electrical training book.

   • Series vs parallel circuits

     In a SERIES circuit, current is the same through every component; voltage adds; total resistance = R1 + R2 + R3. In a PARALLEL circuit, voltage is the same across every branch; current adds; total resistance follows 1/Rt = 1/R1 + 1/R2 + 1/R3 (for two equal resistors in parallel, Rt = R/2). Series resistors REDUCE current; parallel resistors INCREASE current (drop total resistance). Christmas-light analogy: old-style series strings go dark when one bulb fails; modern parallel strings stay lit because each bulb has its own complete loop. Branch circuits in residential wiring are PARALLEL — each receptacle is independent.

   • Units, prefixes, and what an electrician measures

     The standard SI prefixes you must know on sight: micro (µ, 10⁻⁶), milli (m, 10⁻³), kilo (k, 10³), mega (M, 10⁶). An ammeter reading of 250 mA = 0.25 A. A 4.7 kΩ resistor = 4700 Ω. A 1.5 MΩ insulation reading = 1,500,000 Ω. Common practical measurements: receptacle voltage (~120 V or ~240 V), branch-circuit current (15-20 A typical), insulation resistance (millions of ohms = good; thousands = a problem), motor full-load current (variable by HP, typically 5-50 A residential range). The test sometimes phrases questions using these prefixes without converting — be ready.

   Practice questions (2)

   1. 1. A circuit has a 24 V source and a 6 Ω load. What is the current?

      • A.144 A
      • B.4 A✓ correct
      • C.0.25 A
      • D.30 A

      Ohm's law: I = V/R = 24/6 = 4 A. 144 A multiplies V × R (wrong formula). 0.25 A divides 6/24 (inverted). 30 A adds them (also wrong). The triangle V/I/R only has three correct forms — write all three down once before the exam and you will never confuse them.

   2. 2. Three 6 Ω resistors connected in parallel produce a total resistance of:

      • A.18 Ω
      • B.6 Ω
      • C.3 Ω
      • D.2 Ω✓ correct

      For N equal resistors in parallel, Rt = R/N → 6/3 = 2 Ω. 18 Ω is the SERIES total (R1+R2+R3). 6 Ω is one resistor alone. 3 Ω is the parallel result for TWO 6 Ω resistors, not three. Parallel resistors always lower the total resistance below the smallest individual one.

4. 04The panel interview

   ~60min

   After you pass the aptitude, three to five JATC representatives sit across a table and rank you on motivation, work history, problem-solving, and reliability. The interview is half your final composite score.

   • What the panel is really scoring

     The panel uses a standardized rubric — typically scoring you 1-10 in 4-6 dimensions: motivation/desire to be an electrician, willingness to do hard work in adverse conditions, ability to follow direction, problem-solving / mechanical reasoning, communication, and reliability. They are NOT looking for the smartest candidate; they are looking for someone who will FINISH the 5-year apprenticeship, show up on time, and represent the local well. Show up clean-shaven, in slacks and a button-up, with a printed copy of your application. Bring a pen and a notebook. Sit up straight. Make eye contact with EACH panelist when answering — not just the one who asked.

   • The questions that always come

     Expect: "Why do you want to be an electrician?" (have a real answer — not "good money"). "Tell us about your hardest job." (specific, with what YOU did). "Describe a time you disagreed with a supervisor." (resolution-focused, no badmouthing). "What do you know about the IBEW?" (mention solidarity, the joint training trust, the apprenticeship structure). "Why our local?" (research the local — its size, its work, its territory). "Where do you see yourself in 5 years?" (journeyman, with a clear plan to keep learning). Have a 1-2 minute answer for each, but adapt — don't recite. Honest beats polished. The panel can detect coaching.

   • Mechanical reasoning + physicality

     Some panels ask a "puzzle" question — how would you get a 200 lb spool of wire up a ladder? How would you find a break in an underground cable? They are watching how you think aloud, not whether you have the textbook answer. Walk through your reasoning. If you don't know, say so and propose what you'd try. The trade is also physical: the panel may ask whether you can lift 50 lbs, climb a 40 ft ladder, work in confined spaces, or drive 90 minutes to a jobsite. Answer honestly — this is not a sales pitch. Misrepresenting physical capability is a fast way to wash out of the apprenticeship.

   Practice questions (1)

   1. 1. A panelist asks: "Tell us about a time you disagreed with a supervisor." Strongest response framing?

      • A.Describe how the supervisor was wrong and you proved it
      • B.Say you have never disagreed with a supervisor
      • C.Describe the disagreement, what you did to resolve it constructively, and what you learned✓ correct
      • D.Refuse to answer because it is unprofessional

      The panel is testing your CONFLICT-RESOLUTION skill, not your willingness to throw a former boss under the bus. Option C is the STAR-method (Situation, Task, Action, Result) framing — own the disagreement, show resolution, and demonstrate growth. A makes you sound combative; B is implausible (and coachy-fake); D dodges the question. The IBEW jobsite is collaborative — panels need to know you can disagree without escalating.

5. 05Safety + tools — what you should already know

   ~45min

   You won't be expected to be an OSHA expert, but a serious candidate knows lockout/tagout exists, can name basic hand tools, and understands why arc flash is dangerous.

   • Lockout / Tagout (LOTO) basics

     LOTO is the discipline of de-energizing a circuit BEFORE working on it: trip the breaker, lock the breaker in OFF with a personal lock, tag with your name, then VERIFY zero voltage with a meter on every conductor. The lock cannot be removed by anyone but the person who applied it. Each authorized worker on a circuit applies their OWN lock — group LOTO uses a multi-lock hasp. This is the single rule that prevents most fatal electrical-shock incidents in the U.S. Apprentices are taught LOTO from week 1; showing the panel you already understand the concept is a real signal.

     Reference: OSHA 29 CFR 1910.147

   • Hand tools the apprentice carries

     Day-one hand tools: 9" lineman's pliers (cutting + pulling), needle-nose pliers, diagonal cutters, wire stripper (Klein 11055 or similar combo tool), tape measure (25 ft minimum), torpedo level, screwdriver set (Phillips #1 + #2, slotted 1/4" + 3/16"), nut driver set, fish tape, tap drill bits, and a Knipex Cobra or channel-lock for conduit. A tool pouch on a belt with a hammer loop is standard. Spend $200-400 on quality tools BEFORE day one — borrowing tools all week marks you. The local tool truck and your senior journeymen will tell you what brands they trust.

   • PPE — your first paycheck buys these

     Construction-grade hard hat (Type II, side-impact rated), Class 1 electrical work gloves (rubber insulating, voltage-rated for the work — leather protectors over them), safety glasses (Z87.1 rated, with side shields), steel- or composite-toe boots (ASTM F2413), high-visibility vest (Class 2 minimum). Hearing protection for masonry/demo days. Arc-rated FR clothing for any work above 50 V where arc-flash hazard exists — this is mandatory under NFPA 70E and your local will train you on category/incident-energy selection. PPE is non-negotiable: a foreman who sees an apprentice without proper PPE will send them home without pay.

     Reference: NFPA 70E Article 130

   Practice questions (1)

   1. 1. After tripping a breaker as part of LOTO, the next required step before work begins is:

      • A.Start work — the breaker is off
      • B.Verify zero voltage on every conductor with a meter✓ correct
      • C.Wait 5 minutes for capacitors to discharge
      • D.Apply a tag, but no lock

      TEST FOR ZERO VOLTAGE on every conductor with a meter — and test the meter before and after on a known live source to prove it works. A breaker can be miswired, mis-labeled, or back-fed. "Waiting 5 minutes" applies to specific capacitor-heavy circuits but is not the universal step. Tag without lock is forbidden. Starting work without verification is how electricians die.

External resources

• Official
  Electrical Training ALLIANCE — Aptitude Test Bulletin ↗

  Official bulletin from the Electrical Training ALLIANCE (formerly NJATC). Lists test sections, sample questions, and the practice booklet referenced by every JATC. This is the source of truth for what the test actually contains.

• Official
  IBEW — Find Your Local ↗

  Locator for IBEW local unions. Each local sets its own application window, recruitment events, and local-specific interview process. Apply to multiple locals if you can travel — competition varies sharply by region.

• Third-party
  Mike Holt Basic Electrical Theory video series ↗

  Mike Holt is the most-watched electrical-trade educator in the U.S. His free intro videos on Ohm's law, series/parallel circuits, and basic NEC navigation are an excellent (and free) supplement before applying. Not endorsed by IBEW but widely used by apprentices.