- Overview: What the 12 Domains Actually Test
- Exam Format and How Domains Are Assessed
- Foundational AC Theory Domains
- Machines, Generators, and Motors
- Circuit Analysis, Cabling, and Safety Domains
- Domain Comparison at a Glance
- Sequencing Your Study Around the Domains
- Registration, Fees, and Renewal Mechanics
- Frequently Asked Questions
- BEE-AC has exactly 12 domains, from Principles of Alternating Current to Mathematics and Formulas.
- It's a proctored, in-person performance assessment through SPI's Examination Management System - not a multiple-choice-only exam.
- You need a multimeter, function generator, oscilloscope, a Nida 130E (or later) trainer, and two CertTEC assessment circuit cards per discipline.
- Passing score is 70%, exam fee is USD 100, and the credential stays valid for 3 years.
Overview: What the 12 Domains Actually Test
BEE-AC - Basic Electricity and Electronics, Alternating Current - is issued by CertTEC, a division of SpaceTEC Partners, Inc. Unlike a generic multiple-choice technician exam, CertTEC structures BEE-AC around a published set of 12 competency areas that move from pure AC theory into components, machines, and hands-on troubleshooting. If you're wondering what is BEE-AC in the first place, the short answer is: it's a performance-based certification that proves you can measure, wire, and diagnose AC circuits using real test equipment, not just answer questions about them.
This guide walks through all 12 domains as CertTEC publishes them, explains what each one covers in practical terms, and shows how they connect to the equipment and skills you'll actually be graded on. For a broader study strategy that ties these domains into a week-by-week plan, pair this article with the BEE-AC Study Guide 2026.
Exam Format and How Domains Are Assessed
BEE-AC is delivered as a proctored, in-person performance assessment run through SPI's online Examination Management System. That format matters for how you should think about the 12 domains: instead of memorizing definitions in isolation, you need to demonstrate skills against physical equipment. CertTEC's specifications call for two CertTEC assessment circuit cards per discipline, a Nida 130E or later trainer, a multimeter, a function generator, and an oscilloscope.
In practice, this means domains like Test Equipment and Measurements, Cabling, and RC, RL, and RCL Principles aren't tested with abstract questions - they're tested with a card, a trainer, and a scope in front of you. If you've asked how hard is the BEE-AC exam, the honest answer depends heavily on how comfortable you already are physically connecting probes, reading waveforms, and interpreting readings under time pressure, not just how well you know formulas on paper.
Key Takeaway
Because BEE-AC is a hands-on performance assessment, treat every domain below as "can I do this on the bench," not "can I recite this." Practice with an actual multimeter and oscilloscope whenever possible before test day.
Foundational AC Theory Domains
These four domains form the conceptual base that every other domain leans on. Skipping ahead without mastering these tends to cause trouble later, especially in the transformer and motor domains.
Domain 1: Principles of Alternating Current
This is the entry point of the exam and covers how AC differs from DC, sine wave generation, frequency, period, phase relationships, and RMS versus peak values.
- Reading and interpreting a sine wave on an oscilloscope screen
- Calculating peak, peak-to-peak, average, and RMS voltage
- Understanding phase angle and how it appears between two waveforms
Domain 2: Electronic Components and Terms
This domain covers the vocabulary and component identification that everything else is built on - resistors, diodes, transistors, and the basic terminology CertTEC expects you to use precisely during the practical assessment.
- Identifying components by markings and schematic symbols
- Matching correct terminology to functions during troubleshooting narration
- Recognizing component failure modes on a circuit card
Domain 3: Principles of Inductance
Inductance underpins both the transformer and the RL/RCL domains, so this section focuses on how coils store energy in a magnetic field and oppose changes in current.
- Inductive reactance calculations at different frequencies
- Current lag behind voltage in an inductive circuit
- Mutual inductance concepts that carry directly into Transformer Theory
Domain 5: Principles of Capacitance
The mirror image of inductance - this domain covers how capacitors store energy in an electric field and how capacitive reactance behaves as frequency changes.
- Capacitive reactance calculations and frequency dependence
- Current leading voltage in a capacitive circuit
- Charge/discharge behavior relevant to RC troubleshooting later on
Machines, Generators, and Motors
These three domains move from passive components into rotating equipment and require a firmer grip on the inductance concepts from Domain 3.
Domain 4: Transformer Theory
Transformers are one of CertTEC's stated practical focus areas, specifically winding fault diagnosis. Expect to trace primary and secondary windings, verify turns ratios, and identify shorted or open windings.
- Turns ratio and voltage/current relationships between windings
- Identifying open, shorted, or grounded windings with a multimeter
- Step-up versus step-down configuration recognition
Domain 6: AC Generator Theory
Covers how rotating machinery produces alternating current, including basic generator construction and output characteristics.
- Relationship between rotor speed, poles, and frequency output
- Basic generator construction terminology
- Output waveform characteristics under load changes
Domain 7: AC Motor Theory
The counterpart to generator theory - how AC power is converted back into mechanical motion, plus common motor configurations.
- Basic motor types and starting characteristics
- Slip and synchronous speed concepts
- Common motor troubleshooting symptoms
Circuit Analysis, Cabling, and Safety Domains
This group is where the hands-on, bench-based nature of BEE-AC is most obvious. These domains draw heavily on the equipment list - the Nida trainer, function generator, and oscilloscope - and tie directly to CertTEC's stated practical focus on RC/RL circuit troubleshooting.
Domain 8: RC, RL, and RCL Principles
Combines everything from the inductance and capacitance domains into full circuit analysis, including phase relationships, impedance, and resonance in combined circuits.
- Impedance calculation in series and parallel RC/RL/RCL circuits
- Resonance identification in RCL configurations
- Troubleshooting technique for locating faults using a function generator and scope
Domain 9: Cabling
Covers wiring practices, connector types, and cable identification relevant to AC circuit assembly and troubleshooting on the assessment cards.
- Correct wiring and connector selection for a given circuit
- Identifying miswired or damaged cable runs
- Cable labeling and continuity verification
Domain 10: Test Equipment and Measurements
This domain is really the exam's operational core - every piece of required equipment (multimeter, function generator, oscilloscope, Nida trainer) shows up here.
- Correct meter setup, range selection, and probe placement
- Reading and interpreting oscilloscope waveform measurements
- Function generator setup for injecting test signals
Domain 11: Basic Electrical Safety Precautions
Safety procedures around AC voltage, grounding, and lockout practices that apply throughout the entire performance assessment.
- Personal protective steps before touching a live circuit
- Proper de-energizing and verification procedures
- Safe handling of test equipment around AC sources
Domain 12: Mathematics and Formulas
The math domain ties every previous domain together - Ohm's Law, reactance formulas, power calculations, and RMS conversions all reappear here in applied form.
- Ohm's Law and power formula application in AC circuits
- Reactance and impedance formula manipulation
- Unit conversions used across multimeter and scope readings
Domain Comparison at a Glance
The table below groups the 12 domains by their primary focus so you can see where equipment-heavy skills overlap with pure theory.
| Domain | Primary Focus | Key Equipment Involved |
|---|---|---|
| 1. Principles of Alternating Current | Waveform theory | Oscilloscope |
| 2. Electronic Components and Terms | Component ID | Circuit cards |
| 3. Principles of Inductance | Reactance theory | Function generator |
| 4. Transformer Theory | Winding fault diagnosis | Multimeter, circuit cards |
| 5. Principles of Capacitance | Reactance theory | Function generator |
| 6. AC Generator Theory | Rotating machinery output | Trainer |
| 7. AC Motor Theory | Rotating machinery input | Trainer |
| 8. RC, RL, and RCL Principles | Combined circuit troubleshooting | Oscilloscope, function generator |
| 9. Cabling | Wiring and connectors | Circuit cards |
| 10. Test Equipment and Measurements | Instrument setup | All required equipment |
| 11. Basic Electrical Safety Precautions | Safe practice | All required equipment |
| 12. Mathematics and Formulas | Applied calculations | Calculator, multimeter readings |
Sequencing Your Study Around the Domains
Because Domains 3, 5, and 8 build sequentially, and Domain 12's math threads through nearly every other section, a straightforward sequence tends to work better than jumping around by topic name alone.
Foundations
- Domain 1: Principles of Alternating Current
- Domain 2: Electronic Components and Terms
- Domain 12: core Ohm's Law and power formulas
Reactance Pair
- Domain 3: Principles of Inductance
- Domain 5: Principles of Capacitance
- Domain 12: reactance formula drills
Machines
- Domain 4: Transformer Theory (winding fault practice)
- Domain 6: AC Generator Theory
- Domain 7: AC Motor Theory
Bench Skills
- Domain 8: RC, RL, and RCL Principles
- Domain 9: Cabling
- Domain 10: Test Equipment and Measurements
- Domain 11: Basic Electrical Safety Precautions
If you want more detail on pacing full-length review sessions and what to do the final week before your appointment, the BEE-AC Study Guide 2026 lays out a fuller weekly template built around these same domain clusters.
Registration, Fees, and Renewal Mechanics
Domain knowledge is only half the picture - the practical mechanics of sitting for and maintaining BEE-AC matter just as much. CertTEC's exam fee is USD 100 per certification, and the passing score across the 12 domains is 70%. The assessment is proctored in person and delivered through SPI's online Examination Management System, using the equipment set listed in the overview above.
Eligibility to test comes through several routes: relevant training or work experience, a relevant military rating or assignment, or graduation from a relevant college or technical-school program. If you're unsure whether your background qualifies, the BEE-AC Requirements 2026 guide breaks down each eligibility path in more detail.
The current exam specifications reflect SPI's catalog revised March 1, 2025, so the 12 domains above are current with CertTEC's published AC competency topics. For a full cost breakdown including these renewal paths, see BEE-AC Certification Cost 2026. And if you're deciding whether the credential is worth pursuing for your career track, Is the BEE-AC Certification Worth It? walks through the ROI side of that decision, while BEE-AC Jobs looks at where this credential is actually put to use on the job.
Once you've mapped out which domains need the most bench time, it's worth running through timed practice scenarios that mirror the performance-assessment format rather than plain question banks. You can start building that muscle memory on our practice test platform, which is built specifically around these 12 domains rather than generic electronics trivia.
Frequently Asked Questions
Exactly 12: Principles of Alternating Current, Electronic Components and Terms, Principles of Inductance, Transformer Theory, Principles of Capacitance, AC Generator Theory, AC Motor Theory, RC/RL/RCL Principles, Cabling, Test Equipment and Measurements, Basic Electrical Safety Precautions, and Mathematics and Formulas.
It's a proctored, in-person performance assessment delivered through SPI's Examination Management System. You work with physical equipment - a multimeter, function generator, oscilloscope, Nida 130E or later trainer, and CertTEC assessment circuit cards - rather than answering only written questions.
Domain 10 (Test Equipment and Measurements), Domain 8 (RC, RL, and RCL Principles), and Domain 4 (Transformer Theory) are the most equipment-heavy, matching CertTEC's stated practical focus on instrument setup, waveform measurements, transformer winding faults, and RC/RL troubleshooting.
CertTEC sets the passing score at 70%. For a deeper look at how that score is structured and what it means for your prep, see BEE-AC Passing Score 2026.
Yes - since the assessment is performance-based and covers each domain's practical skills directly, there isn't a way to skip a weak domain and rely on strength elsewhere the way you might on a purely written exam. Review scheduling around exam windows is covered in BEE-AC Exam Dates 2026.