NCCER Electrical module 3 (Intro to
Electrical Circuits) Questions and
Answers | Latest Version | 2024/2025 |
Correct & Verified
What is the purpose of a switch in an electrical circuit?
✔✔A switch controls the flow of electricity by either opening or closing the circuit.
What does "AC" stand for in electrical terms?
✔✔AC stands for alternating current, which changes direction periodically.
What is the function of a ground fault circuit interrupter (GFCI)?
✔✔A GFCI detects differences in current between the hot and neutral wires and shuts off the
circuit if a ground fault is detected, preventing electrical shock.
What is the formula to calculate electrical power when only current and resistance are known?
✔✔The formula is P = I² × R, where P is power, I is current, and R is resistance.
What does "DC" stand for in electrical terms?
1
, ✔✔DC stands for direct current, which flows in one direction only.
What is the function of a relay in an electrical circuit?
✔✔A relay is an electrically operated switch used to control a high-power circuit with a low-
power signal.
What is the effect of increasing resistance in a circuit?
✔✔Increasing resistance decreases the current in the circuit, assuming the voltage remains the
same.
How do you calculate the voltage drop in a circuit?
✔✔Voltage drop is calculated by multiplying the current by the resistance in the part of the
circuit (V = I × R).
What is a short circuit?
✔✔A short circuit occurs when electricity flows along an unintended path with very low
resistance, potentially causing overheating or fire.
What is the function of a circuit breaker?
2
Electrical Circuits) Questions and
Answers | Latest Version | 2024/2025 |
Correct & Verified
What is the purpose of a switch in an electrical circuit?
✔✔A switch controls the flow of electricity by either opening or closing the circuit.
What does "AC" stand for in electrical terms?
✔✔AC stands for alternating current, which changes direction periodically.
What is the function of a ground fault circuit interrupter (GFCI)?
✔✔A GFCI detects differences in current between the hot and neutral wires and shuts off the
circuit if a ground fault is detected, preventing electrical shock.
What is the formula to calculate electrical power when only current and resistance are known?
✔✔The formula is P = I² × R, where P is power, I is current, and R is resistance.
What does "DC" stand for in electrical terms?
1
, ✔✔DC stands for direct current, which flows in one direction only.
What is the function of a relay in an electrical circuit?
✔✔A relay is an electrically operated switch used to control a high-power circuit with a low-
power signal.
What is the effect of increasing resistance in a circuit?
✔✔Increasing resistance decreases the current in the circuit, assuming the voltage remains the
same.
How do you calculate the voltage drop in a circuit?
✔✔Voltage drop is calculated by multiplying the current by the resistance in the part of the
circuit (V = I × R).
What is a short circuit?
✔✔A short circuit occurs when electricity flows along an unintended path with very low
resistance, potentially causing overheating or fire.
What is the function of a circuit breaker?
2
