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NYC Health + Hospitals Electrician
Examination Practice Exam 2026 | 100
Questions & Answers with Detailed
Rationales | Complete Exam Prep &
Study Guide
1. What is the primary purpose of a circuit breaker in an electrical circuit?
A. To increase voltage
B. To provide additional lighting
C. To interrupt current when a fault or overload occurs
D. To reduce power consumption
Rationale: A circuit breaker protects conductors and equipment by opening the
circuit when excessive current flows due to an overload or short circuit.
2. What is the standard unit used to measure electrical current?
A. Volt
B. Ohm
C. Watt
D. Ampere
Rationale: The ampere, or amp, is the SI unit used to measure electric current.
3. Which device is designed to protect people from electric shock caused by
ground-fault current?
,A. AFCI
B. GFCI
C. Transformer
D. Disconnect switch
Rationale: A Ground-Fault Circuit Interrupter (GFCI) detects an imbalance
between current leaving and returning through a circuit and rapidly disconnects
power.
4. What is the purpose of grounding an electrical system?
A. To increase circuit voltage
B. To eliminate all electrical resistance
C. To provide a safe path for fault current
D. To increase conductor temperature
Rationale: Grounding provides a low-impedance path for fault current, helping
protective devices operate and reducing shock hazards.
5. Which material is commonly used as an electrical conductor?
A. Glass
B. Rubber
C. PVC
D. Copper
Rationale: Copper has excellent electrical conductivity and is widely used for
building wiring.
6. What does NEC stand for?
A. National Electrical Company
B. New Electrical Construction
C. National Electrical Code
D. National Energy Commission
Rationale: NEC refers to NFPA 70, the National Electrical Code, which provides
requirements for safe electrical installations.
, 7. What is the purpose of an electrical disconnect?
A. To increase circuit amperage
B. To provide a means of disconnecting power from equipment or a circuit
C. To reduce conductor size
D. To convert AC into DC
Rationale: A disconnecting means allows equipment or circuits to be safely
isolated from their source of electrical power.
8. Which instrument is normally used to measure voltage?
A. Ammeter
B. Ohmmeter
C. Voltmeter
D. Watt-hour meter
Rationale: A voltmeter measures the electrical potential difference between two
points.
9. What is Ohm's Law?
A. P = I/R
B. E = I × R
C. I = E × R
D. R = E × I
Rationale: Ohm's Law states that voltage equals current multiplied by
resistance: E = I × R.
10.What happens to current when resistance increases while voltage remains
constant?
A. Current increases
B. Voltage increases
C. Current decreases
D. Power factor becomes zero
NYC Health + Hospitals Electrician
Examination Practice Exam 2026 | 100
Questions & Answers with Detailed
Rationales | Complete Exam Prep &
Study Guide
1. What is the primary purpose of a circuit breaker in an electrical circuit?
A. To increase voltage
B. To provide additional lighting
C. To interrupt current when a fault or overload occurs
D. To reduce power consumption
Rationale: A circuit breaker protects conductors and equipment by opening the
circuit when excessive current flows due to an overload or short circuit.
2. What is the standard unit used to measure electrical current?
A. Volt
B. Ohm
C. Watt
D. Ampere
Rationale: The ampere, or amp, is the SI unit used to measure electric current.
3. Which device is designed to protect people from electric shock caused by
ground-fault current?
,A. AFCI
B. GFCI
C. Transformer
D. Disconnect switch
Rationale: A Ground-Fault Circuit Interrupter (GFCI) detects an imbalance
between current leaving and returning through a circuit and rapidly disconnects
power.
4. What is the purpose of grounding an electrical system?
A. To increase circuit voltage
B. To eliminate all electrical resistance
C. To provide a safe path for fault current
D. To increase conductor temperature
Rationale: Grounding provides a low-impedance path for fault current, helping
protective devices operate and reducing shock hazards.
5. Which material is commonly used as an electrical conductor?
A. Glass
B. Rubber
C. PVC
D. Copper
Rationale: Copper has excellent electrical conductivity and is widely used for
building wiring.
6. What does NEC stand for?
A. National Electrical Company
B. New Electrical Construction
C. National Electrical Code
D. National Energy Commission
Rationale: NEC refers to NFPA 70, the National Electrical Code, which provides
requirements for safe electrical installations.
, 7. What is the purpose of an electrical disconnect?
A. To increase circuit amperage
B. To provide a means of disconnecting power from equipment or a circuit
C. To reduce conductor size
D. To convert AC into DC
Rationale: A disconnecting means allows equipment or circuits to be safely
isolated from their source of electrical power.
8. Which instrument is normally used to measure voltage?
A. Ammeter
B. Ohmmeter
C. Voltmeter
D. Watt-hour meter
Rationale: A voltmeter measures the electrical potential difference between two
points.
9. What is Ohm's Law?
A. P = I/R
B. E = I × R
C. I = E × R
D. R = E × I
Rationale: Ohm's Law states that voltage equals current multiplied by
resistance: E = I × R.
10.What happens to current when resistance increases while voltage remains
constant?
A. Current increases
B. Voltage increases
C. Current decreases
D. Power factor becomes zero
