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Free Practice Questions for Craftsman Electricity

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Key Facts: Craftsman Electricity Exam

60 items

Written CBT question count

Q-Net Craftsman qualification specification

60 minutes

Written CBT time limit

Q-Net examination rules

60 / 100

Passing score (36/60 items, no 과락)

National Technical Qualifications Act Enforcement Rules

KRW 14,500

Written examination fee

Q-Net portal fee schedule (checked 2026)

KRW 106,200

Practical examination fee

Q-Net portal fee schedule (checked 2026)

2 years

Written test exemption period

National Technical Qualifications Act Enforcement Decree Article 21

전기기능사 is HRD Korea's craftsman-grade electrical qualification under MOTIE, taken by 60k+ examinees yearly. The 60-minute written CBT consists of 60 four-option items (passing score: 60/100, no subject minimums) covering electrical theory, machines, and KEC wiring. Fees are KRW 14,500 written and KRW 106,200 practical on Q-Net. OpenExamPrep provides independent English MCQ practice, not an official translation or practical wiring simulation.

Sample Craftsman Electricity Practice Questions

Try these sample questions to review concepts for the Craftsman Electricity exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A copper conductor has a cross-sectional area of 2.0 mm2 and a length of 100 m. Taking the resistivity of copper as ρ = 1.72 × 10^-8 Ω·m, what is its resistance?
A.0.43 Ω
B.0.86 Ω
C.1.72 Ω
D.3.44 Ω
Explanation: Conductor resistance is R = ρ × (L / A). Converting the area to SI units, A = 2.0 mm2 = 2.0 × 10^-6 m2, and with L = 100 m and ρ = 1.72 × 10^-8 Ω·m, R = (1.72 × 10^-8 × 100) / (2.0 × 10^-6) = (1.72 × 10^-6) / (2.0 × 10^-6) = 0.86 Ω. Note that resistance rises in proportion to length and falls in inverse proportion to area, which is why doubling the conductor size halves the loss.
2A direct current of 5 A flows through a 10 Ω resistor for 1 minute. How much heat is produced, taking 1 J ≈ 0.24 cal?
A.1500 cal
B.2500 cal
C.3600 cal
D.15000 cal
Explanation: Joule's law in calorie form is Q = 0.24 × I2 × R × t. With I = 5 A, R = 10 Ω and t = 60 s, the electrical energy is I2Rt = 25 × 10 × 60 = 15,000 J, and Q = 0.24 × 15,000 = 3,600 cal. The square term is the point to remember: doubling the current quadruples the heating.
3A copper coil measures 50.0 Ω at 20 °C. With a temperature coefficient of resistance α20 = 0.00393 /°C, what is its resistance when the coil reaches 70 °C?
A.59.8 Ω
B.65.2 Ω
C.72.4 Ω
D.79.6 Ω
Explanation: Resistance varies with temperature as Rt = R0 × [1 + α × (t − t0)]. The temperature rise is 70 − 20 = 50 °C, so Rt = 50.0 × [1 + 0.00393 × 50] = 50.0 × 1.1965 ≈ 59.8 Ω. Copper has a positive temperature coefficient, so its resistance climbs as a winding heats up - which is exactly how a winding temperature rise test works.
4Which law states that, around any closed loop of a circuit, the sum of the electromotive forces equals the sum of the voltage drops?
A.Coulomb's law (쿨롱의 법칙)
B.Faraday's law of electromagnetic induction (패러데이의 전자유도 법칙)
C.Kirchhoff's current law, KCL (키르히호프의 전류법칙)
D.Kirchhoff's voltage law, KVL (키르히호프의 전압법칙)
Explanation: Kirchhoff's second law, the voltage law (전압법칙, KVL), says that the algebraic sum of potential differences taken once around any closed loop is zero, which is the same as saying the sum of the sources equals the sum of the drops. It follows directly from conservation of energy: a charge carried once around a loop and returned to its starting point must have gained and lost the same energy.
5Four conductors meet at a node. Currents I1 = 8 A and I2 = 5 A flow into the node and I3 = 6 A flows out. What is the magnitude and direction of the current I4 in the fourth conductor?
A.7 A flowing out of the node
B.7 A flowing into the node
C.9 A flowing out of the node
D.9 A flowing into the node
Explanation: Kirchhoff's current law (KCL) requires the total current entering a node to equal the total leaving it. Here 8 + 5 = 13 A enters and only 6 A is accounted for leaving, so the remaining 13 − 6 = 7 A must leave through the fourth conductor. A negative result would simply have meant the assumed direction was reversed.
6R1 = 6 Ω and R2 = 3 Ω are connected in parallel, and R3 = 8 Ω is connected in series with that parallel combination. What is the total resistance?
A.2 Ω
B.6 Ω
C.10 Ω
D.17 Ω
Explanation: Take the parallel pair first: Rp = (6 × 3) / (6 + 3) = 18 / 9 = 2 Ω. A parallel combination is always smaller than the smallest branch, which is a useful sanity check. Adding the series resistor gives Rtotal = 2 + 8 = 10 Ω.
7Two point charges q1 = +4.0 μC and q2 = −3.0 μC are 0.3 m apart in vacuum. Taking 1/(4πε0) = 9.0 × 10^9 N·m2/C2, what is the electrostatic force between them?
A.0.36 N, repulsive
B.1.2 N, attractive
C.1.2 N, repulsive
D.3.6 N, attractive
Explanation: Coulomb's law gives F = (1/4πε0) × |q1q2| / r2 = 9.0 × 10^9 × (4.0 × 10^-6 × 3.0 × 10^-6) / 0.09 = 0.108 / 0.09 = 1.2 N. Because the charges carry opposite signs the force is attractive; like signs would repel. The magnitude falls with the square of separation, so tripling the distance would cut the force to one ninth.
8A point charge Q = 5.0 × 10^-8 C sits in air. What is the electric field strength 3 m away, taking 1/(4πε0) = 9.0 × 10^9 N·m2/C2?
A.15 V/m
B.25 V/m
C.30 V/m
D.50 V/m
Explanation: The field of a point charge is E = (1/4πε0) × Q / r2 = 9.0 × 10^9 × 5.0 × 10^-8 / 32 = 450 / 9 = 50 V/m. Field strength falls with the square of distance, unlike potential, which falls with distance itself.
9How much work is required to move a charge of 0.05 C between two points that differ in potential by 120 V?
A.6.0 J
B.12.0 J
C.24.0 J
D.2400 J
Explanation: Work done in moving a charge through a potential difference is W = Q × V = 0.05 × 120 = 6.0 J. This is also why the volt is defined as one joule per coulomb - the potential difference is literally the energy per unit charge.
10Capacitors of 6 μF and 12 μF are connected in series, and an 8 μF capacitor is then connected in parallel with that combination. What is the total capacitance?
A.4 μF
B.8 μF
C.12 μF
D.26 μF
Explanation: Capacitors in series combine the way resistors in parallel do: Cs = (6 × 12) / (6 + 12) = 72 / 18 = 4 μF. Capacitors in parallel simply add, so Ctotal = 4 + 8 = 12 μF. The reversal relative to resistors is worth memorising, because it is a standard trap.

About the Craftsman Electricity Exam

Craftsman Electricity (전기기능사) is South Korea's premier foundational electrical qualification, administered by HRD Korea on Q-Net under the Ministry of Trade, Industry and Energy. Taken by over 60,000 candidates annually, the credential qualifies technicians for electrical wiring, building facility maintenance, industrial electrical safety, and construction wiring. The 60-question written CBT tests electrostatics, electromagnetism, AC RLC network calculations, DC motors and generators, transformers, 3-phase induction motors, rectifiers, and the Korea Electrotechnical Code (KEC). Candidates who pass the written paper take a 4.5-hour sequence control panel wiring practical test. OpenExamPrep provides an independent English-language MCQ study adaptation for written preparation, not an official translation or sequence wiring workshop simulator.

Exam sponsor: HRD Korea (Q-Net) / Ministry of Trade, Industry and Energy (MOTIE). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Written examination of 60 four-option CBT questions in 60 minutes, drawn 20 items each from Electrical Theory (전기이론), Electrical Machines (전기기기) and Electrical Installations (전기설비) and presented as one mixed paper with no per-subject minimum, followed by a work-type practical examination in 전기설비 작업 of about 4 hours 30 minutes.

Time Limit

60 minutes written; 4 hours 30 minutes practical

Passing Score

Written: 60/100 (36/60); practical: 60/100

Exam / Certification Fees

KRW 14,500 written / KRW 106,200 practical (Q-Net, 2026)

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

20 of 60 items

Electrical Theory (전기이론)

Resistance and resistivity, Joule's law, temperature coefficient, Kirchhoff's laws, Coulomb's law and field strength, capacitance and stored energy, flux density and inductance, AC waveform factors, reactance, series RLC and resonance, star and delta relationships, three-phase power and the two-wattmeter method.

20 of 60 items

Electrical Machines (전기기기)

Commutation and armature reaction, shunt generator build-up, back emf, series motor characteristics, Ward-Leonard control, plugging, transformer ratio, open-circuit and short-circuit tests, maximum-efficiency loading, open delta, parallel operation, induction motor slip and starting, synchronous machines and V-curves, rectifiers and thyristor phase control.

20 of 60 items

Electrical Installations (전기설비)

Conductor joints and soldering flux, wiring tools, conduit fill, bend radius and support spacing, PVC conduit insertion depth, metal duct and busbar rules, cable tray types, KEC voltage bands and conductor colours, TN/TT/IT system earthing, protective conductor and bonding conductor sizing, insulation resistance and leakage current, RCD sensitivity, breaker trip multiples, motor branch circuit sizing, hazardous-area wiring, and voltage drop limits.

Preparing for the Craftsman Electricity Exam

What You Need to Know

  • Passing score: Written: 60/100 (36/60); practical: 60/100
  • Assessment: Written examination of 60 four-option CBT questions in 60 minutes, drawn 20 items each from Electrical Theory (전기이론), Electrical Machines (전기기기) and Electrical Installations (전기설비) and presented as one mixed paper with no per-subject minimum, followed by a work-type practical examination in 전기설비 작업 of about 4 hours 30 minutes.
  • Time limit: 60 minutes written; 4 hours 30 minutes practical
  • Exam / certification fees: KRW 14,500 written / KRW 106,200 practical (Q-Net, 2026) Official sources

Using Our Practice Resources

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

Craftsman Electricity: Suggested Study Strategy

1Treat the paper as 20 items each from 전기이론, 전기기기 and 전기설비, and do not neglect installations: it is pure recall and the cheapest marks on the paper.
2Drill the standard calculations until they are automatic: R = ρL/A, Q = 0.24 I2Rt, series-parallel reduction, XL = 2πfL and XC = 1/(2πfC), Z = √(R2 + X2), and P = √3 VL IL cos θ.
3Learn the machine relationships as families: E = V - IaRa for a motor and V + IaRa for a generator, Ns = 120f/P, s = (Ns - N)/Ns, f2 = sf1, and a = V1/V2 = I2/I1.
4Know the rectifier factors cold - 0.45 for single-phase half wave, 0.90 for single-phase full wave and 1.35 for a three-phase bridge - along with their ripple frequencies.
5Memorise the KEC numbers that recur: 1000 V a.c. and 1500 V d.c. for low voltage, brown-black-grey-blue with green-and-yellow for identification, 500 V d.c. and 1.0 MΩ for insulation testing, and 15 mA within 0.03 s for a bathroom socket RCD.
6Learn the installation dimensions as a set: conduit fill 32 % mixed and 48 % same size, bend radius six times the inside diameter, support spacing 1.0 m flexible, 1.5 m PVC and 2.0 m rigid metal, and duct and busbar support at 3.0 m.
7Keep the Korean terms alongside the English concepts, because the official Q-Net CBT is delivered in Korean.

Frequently Asked Questions

What is Craftsman Electricity (전기기능사)?

It is South Korea's benchmark technical qualification for electrical installations, administered by HRD Korea via Q-Net under the Ministry of Trade, Industry and Energy. It certifies practical competence in wiring, electrical facility operations, and safety.

Who is eligible to take the 전기기능사 exam?

Anyone can apply. As a Craftsman (기능사) level examination under the National Technical Qualifications Act, there are zero education, degree, or experience prerequisites.

What is the examination format and passing score?

The written exam is a 60-minute CBT with 60 four-option multiple-choice questions, 20 each from 전기이론, 전기기기 and 전기설비, mixed into a single paper. The passing score is 60 out of 100 (at least 36 correct answers) and there is no per-subject minimum. The practical exam is a work-type test in 전기설비 작업, about 4 hours 30 minutes long, also requiring 60 points or more out of 100.

What are the registration fees and retake rules?

The written examination fee is KRW 14,500 and the practical fee is KRW 106,200 on Q-Net. Passing the written test grants a 2-year exemption from retaking the written exam under National Technical Qualifications Act Enforcement Decree Article 21.

Is this practice bank affiliated with HRD Korea?

No. This practice bank is an independent English-language MCQ study adaptation created by OpenExamPrep. It is not an official test release, not an official Q-Net simulator, and does not replace hands-on sequence control board wiring practice.