1. What is the standard unit of measurement for electrical
current?
A) Ohm
B) Ampere
C) Volt
D) Watt
Answer: B) Ampere
Rationale: The ampere (amp) measures the flow of electrical current in
a circuit.
2. Which of the following materials is a good electrical
conductor?
A) Rubber
B) Copper
C) Glass
D) Plastic
Answer: B) Copper
Rationale: Copper is widely used as a conductor due to its low
resistance and high conductivity.
3. What device is used to measure voltage in a circuit?
A) Ammeter
B) Ohmmeter
C) Voltmeter
D) Wattmeter
Answer: C) Voltmeter
Rationale: A voltmeter is specifically designed to measure the potential
difference (voltage) in a circuit.
,4. Which type of circuit has only one path for current to flow?
A) Series circuit
B) Parallel circuit
C) Combination circuit
D) Open circuit
Answer: A) Series circuit
Rationale: In a series circuit, all components are connected end-to-end,
providing only one path for current.
5. What color wire is typically used for grounding in residential
wiring?
A) Black
B) White
C) Green
D) Red
Answer: C) Green
Rationale: The green wire is the standard color for grounding to
ensure safety.
6. The total resistance of a parallel circuit is always:
A) Greater than the largest resistor
B) Equal to the smallest resistor
C) Less than the smallest resistor
D) Equal to the sum of all resistors
Answer: C) Less than the smallest resistor
Rationale: In a parallel circuit, adding more branches decreases total
resistance.
, 7. Which of the following is a unit of electrical power?
A) Ampere
B) Volt
C) Watt
D) Ohm
Answer: C) Watt
Rationale: The watt is the standard unit of power, representing the
rate of energy consumption.
8. What is the purpose of a circuit breaker?
A) Measure current
B) Control resistance
C) Prevent overloads and short circuits
D) Increase voltage
Answer: C) Prevent overloads and short circuits
Rationale: Circuit breakers interrupt the flow of electricity when
excessive current is detected.
9. What does Ohm's Law state?
A) Voltage equals current times resistance
B) Power equals voltage times current
C) Current equals voltage divided by resistance
D) Both A and C
Answer: D) Both A and C
Rationale: Ohm's Law is expressed as V = IR, meaning voltage equals
current multiplied by resistance, and rearranged forms describe current
and resistance.
current?
A) Ohm
B) Ampere
C) Volt
D) Watt
Answer: B) Ampere
Rationale: The ampere (amp) measures the flow of electrical current in
a circuit.
2. Which of the following materials is a good electrical
conductor?
A) Rubber
B) Copper
C) Glass
D) Plastic
Answer: B) Copper
Rationale: Copper is widely used as a conductor due to its low
resistance and high conductivity.
3. What device is used to measure voltage in a circuit?
A) Ammeter
B) Ohmmeter
C) Voltmeter
D) Wattmeter
Answer: C) Voltmeter
Rationale: A voltmeter is specifically designed to measure the potential
difference (voltage) in a circuit.
,4. Which type of circuit has only one path for current to flow?
A) Series circuit
B) Parallel circuit
C) Combination circuit
D) Open circuit
Answer: A) Series circuit
Rationale: In a series circuit, all components are connected end-to-end,
providing only one path for current.
5. What color wire is typically used for grounding in residential
wiring?
A) Black
B) White
C) Green
D) Red
Answer: C) Green
Rationale: The green wire is the standard color for grounding to
ensure safety.
6. The total resistance of a parallel circuit is always:
A) Greater than the largest resistor
B) Equal to the smallest resistor
C) Less than the smallest resistor
D) Equal to the sum of all resistors
Answer: C) Less than the smallest resistor
Rationale: In a parallel circuit, adding more branches decreases total
resistance.
, 7. Which of the following is a unit of electrical power?
A) Ampere
B) Volt
C) Watt
D) Ohm
Answer: C) Watt
Rationale: The watt is the standard unit of power, representing the
rate of energy consumption.
8. What is the purpose of a circuit breaker?
A) Measure current
B) Control resistance
C) Prevent overloads and short circuits
D) Increase voltage
Answer: C) Prevent overloads and short circuits
Rationale: Circuit breakers interrupt the flow of electricity when
excessive current is detected.
9. What does Ohm's Law state?
A) Voltage equals current times resistance
B) Power equals voltage times current
C) Current equals voltage divided by resistance
D) Both A and C
Answer: D) Both A and C
Rationale: Ohm's Law is expressed as V = IR, meaning voltage equals
current multiplied by resistance, and rearranged forms describe current
and resistance.
