NCCER 26404 Basic Electrical Theory
Questions and Answers | Latest Version
| 2024/2025 | Correct & Verified
What is the purpose of a capacitor in an electrical circuit?
✔✔A capacitor stores and releases electrical energy to help smooth out voltage fluctuations.
How do you calculate the total resistance in a series circuit?
✔✔In a series circuit, the total resistance is the sum of all individual resistances.
How do you calculate the total resistance in a parallel circuit?
✔✔In a parallel circuit, the total resistance is found by using the formula 1/R_total = 1/R1 +
1/R2 + 1/R3 + ... for each resistor.
What is the function of an inductor in an electrical circuit?
✔✔An inductor stores electrical energy in a magnetic field and resists changes in current.
What is a voltmeter used for?
✔✔A voltmeter measures the voltage, or potential difference, across two points in a circuit.
1
, What is the function of a diode in an electrical circuit?
✔✔A diode allows current to flow in only one direction and blocks it in the opposite direction.
What does an ammeter measure?
✔✔An ammeter measures the current flowing through a circuit.
What is the purpose of electrical insulation?
✔✔Electrical insulation prevents unintended flow of current and protects people from electrical
shock.
What is Ohm's Law?
✔✔Ohm's Law states that the current in a circuit is directly proportional to the voltage and
inversely proportional to the resistance (I = V/R).
What is the unit of electrical resistance?
✔✔The unit of electrical resistance is the ohm (Ω).
2
Questions and Answers | Latest Version
| 2024/2025 | Correct & Verified
What is the purpose of a capacitor in an electrical circuit?
✔✔A capacitor stores and releases electrical energy to help smooth out voltage fluctuations.
How do you calculate the total resistance in a series circuit?
✔✔In a series circuit, the total resistance is the sum of all individual resistances.
How do you calculate the total resistance in a parallel circuit?
✔✔In a parallel circuit, the total resistance is found by using the formula 1/R_total = 1/R1 +
1/R2 + 1/R3 + ... for each resistor.
What is the function of an inductor in an electrical circuit?
✔✔An inductor stores electrical energy in a magnetic field and resists changes in current.
What is a voltmeter used for?
✔✔A voltmeter measures the voltage, or potential difference, across two points in a circuit.
1
, What is the function of a diode in an electrical circuit?
✔✔A diode allows current to flow in only one direction and blocks it in the opposite direction.
What does an ammeter measure?
✔✔An ammeter measures the current flowing through a circuit.
What is the purpose of electrical insulation?
✔✔Electrical insulation prevents unintended flow of current and protects people from electrical
shock.
What is Ohm's Law?
✔✔Ohm's Law states that the current in a circuit is directly proportional to the voltage and
inversely proportional to the resistance (I = V/R).
What is the unit of electrical resistance?
✔✔The unit of electrical resistance is the ohm (Ω).
2
