NCCER Electrical Theory Lvl 1 Module 4
Questions and Answers | Latest Version
| 2024/2025 | Correct & Verified
How does an electrical meter measure energy consumption?
✔✔ An electrical meter measures the amount of electricity used in kilowatt-hours (kWh).
What is the role of a switch in an electrical circuit?
✔✔ A switch controls the flow of electricity, allowing the user to turn the circuit on or off.
What is a magnetic field?
✔✔ A magnetic field is a region around a magnetic material where magnetic forces can be felt.
What is the relationship between voltage, current, and resistance?
✔✔ Voltage equals current multiplied by resistance (V = IR), according to Ohm’s Law.
What is voltage?
✔✔ Voltage is the electrical potential difference between two points, driving the flow of current.
1
, What is the unit of measurement for electrical current?
✔✔ The unit for electrical current is the ampere (A).
What does Ohm’s Law state?
✔✔ Ohm’s Law states that voltage equals current times resistance (V = IR).
What is resistance in an electrical circuit?
✔✔ Resistance is the opposition to the flow of electric current, measured in ohms (Ω).
Why is a circuit breaker important in an electrical system?
✔✔ A circuit breaker protects the system from overloads by interrupting the flow of electricity
when necessary.
What is the difference between AC and DC current?
✔✔ AC (alternating current) reverses direction periodically, while DC (direct current) flows in
one constant direction.
What is a conductor?
2
Questions and Answers | Latest Version
| 2024/2025 | Correct & Verified
How does an electrical meter measure energy consumption?
✔✔ An electrical meter measures the amount of electricity used in kilowatt-hours (kWh).
What is the role of a switch in an electrical circuit?
✔✔ A switch controls the flow of electricity, allowing the user to turn the circuit on or off.
What is a magnetic field?
✔✔ A magnetic field is a region around a magnetic material where magnetic forces can be felt.
What is the relationship between voltage, current, and resistance?
✔✔ Voltage equals current multiplied by resistance (V = IR), according to Ohm’s Law.
What is voltage?
✔✔ Voltage is the electrical potential difference between two points, driving the flow of current.
1
, What is the unit of measurement for electrical current?
✔✔ The unit for electrical current is the ampere (A).
What does Ohm’s Law state?
✔✔ Ohm’s Law states that voltage equals current times resistance (V = IR).
What is resistance in an electrical circuit?
✔✔ Resistance is the opposition to the flow of electric current, measured in ohms (Ω).
Why is a circuit breaker important in an electrical system?
✔✔ A circuit breaker protects the system from overloads by interrupting the flow of electricity
when necessary.
What is the difference between AC and DC current?
✔✔ AC (alternating current) reverses direction periodically, while DC (direct current) flows in
one constant direction.
What is a conductor?
2
