West Virginia (WV) Electrician, Helper/Journeyman/Master Exam
Question 1. What is Ohm's Law primarily used to determine in electrical circuits?
- Power consumption
- Voltage, current, and resistance relationships
- Frequency of AC signals
- Capacitance effects
Answer: B
Explanation: Ohm's Law states that voltage equals current times
resistance (V=IR), which is fundamental for calculating relationships between these quantities in circuits.
Question 2. Which unit is used to measure electrical power in watts?
- Volt
- Ampere
- Watt
- Ohm
Answer: C
Explanation: Watts measure electrical power, representing the rate of
energy transfer in a circuit.
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West Virginia (WV) Electrician, Helper/Journeyman/Master Exam
Question 3. In a series circuit, the total resistance is:
- Equal to the resistance of the largest resistor
- The sum of all resistances
- The reciprocal of the sum of reciprocals
- Less than the smallest resistor
Answer: B
Explanation: In series, resistances add directly, so total resistance equals
the sum of individual resistances.
Question 4. Which of the following best describes AC (Alternating Current)?
- Flows in only one direction
- Changes direction periodically
- Is used exclusively in batteries
- Has a constant amplitude
Answer: B
Explanation: AC periodically reverses direction, which makes it suitable
for power transmission over long distances.
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West Virginia (WV) Electrician, Helper/Journeyman/Master Exam
Question 5. What is the primary difference between single-phase and three-phase systems?
- Number of conductors used
- Voltage levels
- Power delivery method and efficiency
- Frequency of the current
Answer: C
Explanation: Three-phase systems deliver more efficient power for
industrial loads and have different connection configurations compared to single-phase systems.
Question 6. Which magnetic property describes the ability to attract ferromagnetic materials?
- Magnetism
- Electromagnetism
- Conductivity
- Resistance
Answer: A
Explanation: Magnetism refers to the force that attracts ferromagnetic
materials like iron.
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West Virginia (WV) Electrician, Helper/Journeyman/Master Exam
Question 7. Inductance in a circuit primarily causes which of the following?
- Voltage lagging current
- Voltage leading current
- Instantaneous power increase
- No effect on circuit behavior
Answer: A
Explanation: Inductance opposes changes in current, causing voltage to
lag behind current.
Question 8. Which unit measures capacitance?
- Henry
- Farad
- Ohm
- Volt
Answer: B
Explanation: Capacitance is measured in farads, representing a
capacitor's ability to store charge.
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