Basic Electricity waec past questions and answers

Basic Electricity waec past questions and answers

20 basic electricity questions with options and answers:

What is the unit of electrical resistance?

A) Watt

B) Volt

C) Ampere

D) Ohm

Answer: D) Ohm

Which material is a good conductor of electricity?

A) Plastic

B) Wood

C) Copper

D) Rubber

Answer: C) Copper

What is the SI unit of electric current?

A) Ampere

B) Volt

C) Ohm

D) Joule

Answer: A) Ampere

Which component stores electrical charge?

A) Resistor

B) Capacitor

C) Inductor

D) Diode

Answer: B) Capacitor

What does AC stand for in electrical terms?

A) Alternating Current

B) Active Current

C) Alternating Charge

D) Amperage Current

Answer: A) Alternating Current

What is the formula for calculating electrical power?

A) P = IV

B) P = IR

C) P = V^2 / R

D) P = I^2R

Answer: A) P = IV

Which law describes the relationship between current, voltage, and resistance in an electrical circuit?

A) Ohm's Law

B) Gauss's Law

C) Newton's Law

D) Coulomb's Law

Answer: A) Ohm's Law

Which component allows the flow of current in one direction only?

A) Resistor

B) Capacitor

C) Inductor

D) Diode

Answer: D) Diode

What is the purpose of a fuse in an electrical circuit?

A) To regulate voltage

B) To store charge

C) To break the circuit when there's an overload

D) To increase current flow

Answer: C) To break the circuit when there's an overload

Which device changes high voltage to low voltage and vice versa?

A) Transformer

B) Capacitor

C) Diode

D) Inductor

Answer: A) Transformer

What type of electricity do batteries produce?

A) Direct Current (DC)

B) Alternating Current (AC)

C) Static Electricity

D) Magnetic Current

Answer: A) Direct Current (DC)

What is the unit of electrical potential difference?

A) Ampere

B) Ohm

C) Volt

D) Joule

Answer: C) Volt

Which law states that the total current entering a junction is equal to the total current leaving the junction?

A) Kirchhoff's Law

B) Gauss's Law

C) Ohm's Law

D) Faraday's Law

Answer: A) Kirchhoff's Law

What happens to resistance in a conductor if its temperature increases?

A) Increases

B) Decreases

C) Remains the same

D) Becomes zero

Answer: A) Increases

Which material is commonly used as an insulator in electrical wires?

A) Copper

B) Silver

C) Aluminum

D) Rubber

Answer: D) Rubber

Which device measures electric current?

A) Ammeter

B) Voltmeter

C) Ohmmeter

D) Galvanometer

Answer: A) Ammeter

What causes a short circuit in an electrical system?

A) Excessive voltage

B) High resistance

C) Low resistance path

D) Low voltage

Answer: C) Low resistance path

What is the function of an insulator in an electrical system?

A) To control current flow

B) To conduct electricity

C) To store charge

D) To prevent current flow

Answer: D) To prevent current flow

What device is used to regulate voltage in an electrical circuit?

A) Capacitor

B) Resistor

C) Inductor

D) Voltage Regulator

Answer: D) Voltage Regulator

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

A) To maintain constant voltage

B) To limit current flow

C) To store electrical energy

D) To increase resistance

Answer: B) To limit current flow