NECA Electrical Theory & Principles

Question 1

What is Ohm's Law?

Accepted Answer

V = IR

Answer

V = I / R

Answer

V = I + R

Answer

V = I - R

Question 2

What does the term 'ampacity' refer to?

Accepted Answer

The maximum current a conductor can safely carry

Answer

The power rating of a transformer

Answer

The voltage at which a conductor operates

Answer

The energy consumption of a circuit

Question 3

What is the purpose of grounding in electrical systems?

Accepted Answer

To provide a safe path for the discharge of current

Answer

To increase the resistance in the circuit

Answer

To prevent electrical overloads

Answer

To increase circuit efficiency

Question 4

Which of the following is the unit of electrical power?

Accepted Answer

Watt

Answer

Volt

Answer

Ampere

Answer

Ohm

Question 5

What is the primary difference between AC and DC current?

Accepted Answer

AC changes direction periodically, DC flows in one direction

Answer

AC flows in one direction, DC changes direction periodically

Answer

AC and DC both flow in the same direction

Answer

AC is used in batteries, DC is used in outlets

Question 6

What is the function of a circuit breaker?

Accepted Answer

To protect the circuit from overloads and short circuits

Answer

To increase the current in the circuit

Answer

To reduce the voltage in the circuit

Answer

To store electrical energy

Question 7

Which of the following is a common type of electrical conductor?

Accepted Answer

Answer

Copper

Answer

Wood

Answer

Plastic

Answer

Rubber

Question 8

What is the purpose of a transformer?

Accepted Answer

To increase or decrease voltage

Answer

To change the frequency of the electrical signal

Answer

To convert DC to AC

Answer

To regulate current flow

Question 9

What does the term 'impedance' refer to in an AC circuit?

Accepted Answer

The opposition to current flow in an AC circuit

Answer

The current in the circuit

Answer

The power consumed in the circuit

Answer

The voltage drop across the circuit