1. What is the primary function of an electrical transformer?
A. Increase current
B. Reduce resistance
C. Change voltage levels
D. Measure voltage
Answer: C) Change voltage levels
Rationale: Transformers adjust voltage up or down to suit specific
applications.
2. Which wire size has the smallest diameter?
A. 12 AWG
B. 10 AWG
C. 14 AWG
D. 8 AWG
Answer: C) 14 AWG
Rationale: Smaller AWG numbers indicate larger wire diameters.
3. The formula V=IRV = IRV=IR represents:
A. Watt’s Law
B. Joule’s Law
,C. Ohm’s Law
D. Kirchhoff’s Voltage Law
Answer: C) Ohm’s Law
Rationale: Ohm’s Law defines the relationship between voltage,
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. Which device protects a circuit from excess current?
A. Fuse
B. Transformer
C. Resistor
D. Capacitor
Answer: A) Fuse
, Rationale: A fuse melts to interrupt the circuit when excess current
flows.
6. A three-way switch is commonly used to:
A. Turn lights on and off from two locations
B. Control fan speed
C. Adjust voltage
D. Measure resistance
Answer: A) Turn lights on and off from two locations
Rationale: Three-way switches allow control of a light fixture from two
different locations.
7. 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.
8. In a circuit, resistance is measured in:
A. Increase current
B. Reduce resistance
C. Change voltage levels
D. Measure voltage
Answer: C) Change voltage levels
Rationale: Transformers adjust voltage up or down to suit specific
applications.
2. Which wire size has the smallest diameter?
A. 12 AWG
B. 10 AWG
C. 14 AWG
D. 8 AWG
Answer: C) 14 AWG
Rationale: Smaller AWG numbers indicate larger wire diameters.
3. The formula V=IRV = IRV=IR represents:
A. Watt’s Law
B. Joule’s Law
,C. Ohm’s Law
D. Kirchhoff’s Voltage Law
Answer: C) Ohm’s Law
Rationale: Ohm’s Law defines the relationship between voltage,
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. Which device protects a circuit from excess current?
A. Fuse
B. Transformer
C. Resistor
D. Capacitor
Answer: A) Fuse
, Rationale: A fuse melts to interrupt the circuit when excess current
flows.
6. A three-way switch is commonly used to:
A. Turn lights on and off from two locations
B. Control fan speed
C. Adjust voltage
D. Measure resistance
Answer: A) Turn lights on and off from two locations
Rationale: Three-way switches allow control of a light fixture from two
different locations.
7. 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.
8. In a circuit, resistance is measured in:
