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The Journeyperson Electrician Exam is a licensure test for electricians who have completed an approved apprenticeship or equivalent training. It tests practical and theoretical knowledge of the National Electrical Code, wiring installations, conduit systems, grounding and bonding, circuit protection, blueprint reading, and jobsite safety. Passing this exam grants authority to perform electrical work under the supervision of a master electrician or electrical contractor.
Typology: Exams
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Question 1. According to Ohm’s Law, if the voltage across a resistor is 120 V and the resistance is 60 Ω, what is the current flowing through the resistor? A) 2 A B) 0.5 A C) 120 A D) 1800 A Answer: A Explanation: Ohm’s Law states I = V / R. Substituting the values, I = 120 V / 60 Ω = 2 A. Question 2. Which of the following formulas correctly calculates electrical power in watts? A) P = V × I
Answer: A Explanation: Power is calculated as P = V × I, representing voltage times current. Question 3. In a series circuit with three resistors of 10 Ω, 20 Ω, and 30 Ω, what is the total resistance? A) 10 Ω B) 60 Ω C) 20 Ω D) 30 Ω
Question 5. A combination circuit has a 10 Ω resistor in series with a parallel branch of 20 Ω and 40 Ω resistors. What is the total resistance? A) 10 Ω + (1 / (1/20 + 1/40)) Ω B) 10 Ω + 60 Ω C) 10 Ω + 20 Ω D) 10 Ω + 13.3 Ω Answer: D Explanation: The parallel resistance of 20 Ω and 40 Ω is Req = 1 / (1/20 + 1/40) = 1 / (0.05 + 0.025) = 1 / 0.075 ≈ 13.3 Ω. Total resistance = 10 + 13.3 ≈ 23.3 Ω. Question 6. Which statement correctly differentiates AC from DC?
A) AC has a constant voltage, while DC voltage varies periodically. B) DC current flows in only one direction, AC current reverses periodically. C) AC circuits do not require transformers, while DC circuits do. D) DC is used only in power distribution, AC is used in batteries. Answer: B Explanation: DC current flows in one direction, while AC current alternates direction periodically. Question 7. What is the primary advantage of three-phase power systems over single-phase systems? A) Lower voltage B) Increased efficiency and power delivery capacity C) Simpler wiring
Question 9. What is electromagnetic induction? A) The process of generating voltage by changing magnetic flux around a conductor B) The magnetic field created by an electric current C) The conversion of electrical energy into mechanical energy in a motor D) The process of increasing resistance in a circuit using a magnetic field Answer: A Explanation: Electromagnetic induction occurs when a changing magnetic flux induces a voltage in a conductor. Question 10. Which type of transformer is typically used to step down high- voltage transmission lines to lower voltages for distribution?
A) Autotransformer B) Step-up transformer C) Step-down transformer D) Isolation transformer Answer: C Explanation: Step-down transformers reduce high transmission voltages to safer, usable levels for consumers. Question 11. Which motor type operates on direct current and uses brushes and a commutator? A) Induction motor B) Synchronous motor C) DC motor
Explanation: Generators convert mechanical energy into electrical energy via electromagnetic induction. Question 13. Which chapter of the NEC covers the general requirements for electrical installations? A) Chapter 1 B) Chapter 2 C) Chapter 3 D) Chapter 4 Answer: A Explanation: NEC Chapter 1 provides the scope and general requirements for electrical installations.
Question 14. In branch circuit calculations, which of the following factors must be considered? A) Voltage drop only B) Load type, appliance ratings, and code requirements C) Only the total wattage of appliances D) The length of the circuit wire only Answer: B Explanation: Load type, appliance ratings, and code requirements influence branch circuit sizing. Question 15. What is the minimum GFCI protection requirement for receptacles in a bathroom according to NEC? A) None
Answer: B Explanation: Service conductors must be sized based on the total load and NEC guidelines to ensure safety and capacity. Question 17. What is the purpose of grounding in electrical systems? A) To complete the circuit B) To prevent electric shock and ensure safety by providing a path to earth C) To increase voltage levels D) To reduce current flow Answer: B Explanation: Grounding provides a safe path for fault currents, reducing shock hazards and equipment damage.
Question 18. Which of the following conductors is typically used for high- temperature applications and is identified by its insulation color? A) Copper with THHN insulation B) Aluminum with XHHW insulation C) Copper with THHN insulation, usually color-coded for identification D) Bare copper only Answer: C Explanation: THHN insulated copper conductors are common in high- temperature applications and are color-coded for identification. Question 19. Which raceway type is rigid and metallic, suitable for indoor and outdoor use, and provides good physical protection? A) EMT (Electrical Metallic Tubing)
D) Unlimited conductors if properly supported Answer: B Explanation: NEC specifies maximum fill based on conductor volume and device requirements to prevent overcrowding. Question 21. Which type of lighting fixture is best suited for high-humidity areas like bathrooms? A) Incandescent fixtures B) Wet-location rated fixtures C) Fluorescent fixtures D) Low-voltage landscape fixtures Answer: B
Explanation: Wet-location rated fixtures are designed to withstand high humidity and moisture. Question 22. For motor overload protection, which device is most commonly used? A) Fuse B) Overcurrent relay C) Thermal overload relay or motor overload protector D) GFCI Answer: C Explanation: Thermal overload relays or motor overload protectors are designed to prevent motor damage from excessive current.
B) Chapter 5 C) Chapter 6 D) Chapter 7 Answer: B Explanation: Chapter 5 addresses special occupancies, including theaters and garages. Question 25. Which of the following is a key aspect of lockout/tagout procedures? A) Ensuring equipment is energized during maintenance B) Isolating and disabling equipment to prevent accidental energization during maintenance C) Removing all safety signs before working
D) Only used for electrical disconnects in residential systems Answer: B Explanation: Lockout/tagout procedures ensure equipment is safely isolated and disabled to protect workers from accidental energization. Question 26. What is the purpose of a ground-fault circuit interrupter (GFCI)? A) To protect against overloads in circuits B) To detect imbalance in current and quickly disconnect power to prevent shocks C) To limit the maximum current flow D) To protect against short circuits only Answer: B
