NCCER Electrical Level 1 Mod 4
Electrical Theory Questions and
Answers | Latest Version | 2024/2025 |
Correct & Verified
What is the primary purpose of an electrical circuit?
✔✔ To provide a path for electrical current to flow and power devices
What does a watt-hour meter measure?
✔✔ The amount of electrical energy consumed over time
What is the function of an electrical panel’s main disconnect switch?
✔✔ To cut off all power to the electrical circuits in the building
What is the difference between a conductor and a semiconductor?
✔✔ A conductor allows electricity to flow easily, while a semiconductor has properties between
a conductor and an insulator
What is a fuse's primary role in a circuit?
1
,✔✔ To protect the circuit by breaking the connection when the current exceeds a certain limit
What is the effect of adding more resistors in series?
✔✔ The total resistance increases, which reduces current flow
What is the function of a solenoid in an electrical system?
✔✔ To convert electrical energy into mechanical motion
What is the difference between a synchronous motor and an induction motor?
✔✔ A synchronous motor operates at a constant speed, while an induction motor's speed varies
with the load
What is a common cause of voltage spikes in electrical systems?
✔✔ Lightning strikes or switching on and off heavy electrical equipment
What is the main function of a relay in an electrical circuit?
✔✔ To use a small current to control a larger current in a separate circuit
2
, What is impedance in an electrical circuit?
✔✔ The total resistance to current flow, including both resistance and reactance
What is the purpose of a light dimmer switch?
✔✔ To adjust the brightness of a light by varying the voltage applied to the light bulb
What is the role of a busbar in an electrical system?
✔✔ To distribute electrical power to multiple circuits from a single source
What does a power factor represent in an electrical system?
✔✔ The efficiency with which electrical power is converted into useful work
What is the function of a circuit breaker?
✔✔ To automatically interrupt the flow of current in the event of an overload or short circuit
What does a capacitor store in an electrical system?
✔✔ Electrical energy
3
Electrical Theory Questions and
Answers | Latest Version | 2024/2025 |
Correct & Verified
What is the primary purpose of an electrical circuit?
✔✔ To provide a path for electrical current to flow and power devices
What does a watt-hour meter measure?
✔✔ The amount of electrical energy consumed over time
What is the function of an electrical panel’s main disconnect switch?
✔✔ To cut off all power to the electrical circuits in the building
What is the difference between a conductor and a semiconductor?
✔✔ A conductor allows electricity to flow easily, while a semiconductor has properties between
a conductor and an insulator
What is a fuse's primary role in a circuit?
1
,✔✔ To protect the circuit by breaking the connection when the current exceeds a certain limit
What is the effect of adding more resistors in series?
✔✔ The total resistance increases, which reduces current flow
What is the function of a solenoid in an electrical system?
✔✔ To convert electrical energy into mechanical motion
What is the difference between a synchronous motor and an induction motor?
✔✔ A synchronous motor operates at a constant speed, while an induction motor's speed varies
with the load
What is a common cause of voltage spikes in electrical systems?
✔✔ Lightning strikes or switching on and off heavy electrical equipment
What is the main function of a relay in an electrical circuit?
✔✔ To use a small current to control a larger current in a separate circuit
2
, What is impedance in an electrical circuit?
✔✔ The total resistance to current flow, including both resistance and reactance
What is the purpose of a light dimmer switch?
✔✔ To adjust the brightness of a light by varying the voltage applied to the light bulb
What is the role of a busbar in an electrical system?
✔✔ To distribute electrical power to multiple circuits from a single source
What does a power factor represent in an electrical system?
✔✔ The efficiency with which electrical power is converted into useful work
What is the function of a circuit breaker?
✔✔ To automatically interrupt the flow of current in the event of an overload or short circuit
What does a capacitor store in an electrical system?
✔✔ Electrical energy
3
