PEC Electrical Theory & Principles

Question 1

What is Ohm's Law?

Accepted Answer

V = I × R.

Answer

V = I + R.

Answer

V = I - R.

Answer

V = I ÷ R.

Question 2

What is the unit of electrical power?

Accepted Answer

Watts.

Answer

Amps.

Answer

Volts.

Answer

Ohms.

Question 3

What is the difference between alternating current (AC) and direct current (DC)?

Accepted Answer

AC flows in one direction; DC flows in one direction.

Answer

AC flows in one direction; DC reverses direction periodically.

Answer

AC reverses direction periodically; DC flows in one direction.

Answer

AC and DC are the same.

Question 4

What does a fuse do in an electrical circuit?

Accepted Answer

It protects the circuit by breaking the connection when the current is too high.

Answer

It increases the current.

Answer

It controls the voltage.

Answer

It provides power to the circuit.

Question 5

What is the primary function of a transformer in an electrical circuit?

Accepted Answer

To change the voltage level of alternating current (AC).

Answer

To store energy.

Answer

To change the current's direction.

Answer

To convert AC to DC.

Question 6

What is the purpose of grounding in electrical systems?

Accepted Answer

To provide a safe path for fault currents.

Answer

To increase current flow.

Answer

To prevent overloading the circuit.

Answer

To store electrical energy.

Question 7

What does a circuit breaker do?

Accepted Answer

It automatically interrupts the circuit if there is an overload or short circuit.

Answer

It increases the circuit's current.

Answer

It allows more electricity to flow through.

Answer

It stores excess energy.

Question 8

What is the unit of measurement for electrical resistance?

Accepted Answer

Ohms.

Answer

Amps.

Answer

Watts.

Answer

Volts.

Question 9

What is the primary purpose of a capacitor in an electrical circuit?

Accepted Answer

To store and release electrical energy.

Answer

To provide electrical power.

Answer

To increase the current.

Answer

To increase the voltage.