1. 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.
2. What is the role of a capacitor in a circuit?
A. Store electrical energy
B. Reduce resistance
C. Convert AC to DC
D. Measure voltage
Answer: A) Store electrical energy
Rationale: Capacitors temporarily store and release electrical energy.
3. 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.
4. The formula P=I2RP = I^2RP=I2R is used to calculate:
A. Voltage
B. Current
C. Power
D. Resistance
Answer: C) Power
Rationale: This formula calculates power based on current and
resistance.
5. The role of a rectifier in an electrical circuit is to:
A. Increase voltage
B. Convert AC to DC
C. Reduce current
D. Store energy
, Answer: B) Convert AC to DC
Rationale: Rectifiers convert alternating current (AC) to direct current
(DC).
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. What device is used to protect sensitive equipment from voltage
spikes?
A. Circuit breaker
B. Fuse
C. Surge protector
D. Capacitor
Answer: C) Surge protector
Rationale: Surge protectors divert excess voltage away from sensitive
devices.
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.
2. What is the role of a capacitor in a circuit?
A. Store electrical energy
B. Reduce resistance
C. Convert AC to DC
D. Measure voltage
Answer: A) Store electrical energy
Rationale: Capacitors temporarily store and release electrical energy.
3. 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.
4. The formula P=I2RP = I^2RP=I2R is used to calculate:
A. Voltage
B. Current
C. Power
D. Resistance
Answer: C) Power
Rationale: This formula calculates power based on current and
resistance.
5. The role of a rectifier in an electrical circuit is to:
A. Increase voltage
B. Convert AC to DC
C. Reduce current
D. Store energy
, Answer: B) Convert AC to DC
Rationale: Rectifiers convert alternating current (AC) to direct current
(DC).
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. What device is used to protect sensitive equipment from voltage
spikes?
A. Circuit breaker
B. Fuse
C. Surge protector
D. Capacitor
Answer: C) Surge protector
Rationale: Surge protectors divert excess voltage away from sensitive
devices.
