California Solar Contractor Exam (C-46)
Questions and Correct Answers
(Verified Answers) Plus Rationales 2025
Q&A | Instant Download PDF
Question 1
What does PV stand for in a solar energy system?
A. Power Voltage
B. Photovoltaic
C. Phase Variable
D. Primary Voltage
Correct Answer: B. Photovoltaic
Rationale:
Photovoltaic refers to the process of converting sunlight directly into electricity
using solar cells. It is the fundamental technology used in solar electric systems.
The other options are not standard meanings of PV in the solar industry.
Question 2
Which component converts DC electricity into AC electricity?
A. Charge controller
B. Inverter
C. Combiner box
D. Disconnect switch
Correct Answer: B. Inverter
Rationale:
An inverter changes direct current (DC) from solar panels into alternating current
,(AC), which is used by most homes and businesses. Charge controllers regulate
battery charging, combiner boxes combine circuits, and disconnect switches
isolate equipment.
Question 3
Solar photovoltaic modules produce what type of electricity?
A. Alternating current (AC)
B. Direct current (DC)
C. Three-phase AC
D. Variable frequency AC
Correct Answer: B. Direct current (DC)
Rationale:
Solar modules naturally generate direct current (DC). An inverter is required to
convert this electricity into alternating current (AC) for most electrical loads.
Question 4
Which instrument measures electrical voltage?
A. Ammeter
B. Ohmmeter
C. Voltmeter
D. Thermometer
Correct Answer: C. Voltmeter
Rationale:
A voltmeter measures electrical potential difference (voltage). Ammeters
measure current, ohmmeters measure resistance, and thermometers measure
temperature.
Question 5
,What is the primary purpose of an inverter?
A. Increase battery capacity
B. Convert DC power to AC power
C. Reduce panel temperature
D. Store solar energy
Correct Answer: B. Convert DC power to AC power
Rationale:
The inverter converts DC electricity produced by solar panels into AC electricity
suitable for homes and the utility grid.
Question 6
Which unit measures electrical power?
A. Volt
B. Ampere
C. Watt
D. Ohm
Correct Answer: C. Watt
Rationale:
A watt is the standard unit of electrical power and represents the rate at which
electrical energy is used or produced.
Question 7
Which unit measures electrical current?
A. Volt
B. Ampere
C. Watt
D. Ohm
Correct Answer: B. Ampere
, Rationale:
Electrical current is measured in amperes (amps). Voltage is measured in volts,
resistance in ohms, and power in watts.
Question 8
Which unit measures electrical resistance?
A. Watt
B. Volt
C. Ampere
D. Ohm
Correct Answer: D. Ohm
Rationale:
Resistance opposes the flow of electrical current and is measured in ohms (Ω).
Question 9
What device protects a circuit from excessive current?
A. Inverter
B. Transformer
C. Circuit breaker
D. Combiner box
Correct Answer: C. Circuit breaker
Rationale:
A circuit breaker interrupts current flow when excessive current is detected,
protecting equipment and wiring from damage.
Question 10
What is the main function of a combiner box?
Questions and Correct Answers
(Verified Answers) Plus Rationales 2025
Q&A | Instant Download PDF
Question 1
What does PV stand for in a solar energy system?
A. Power Voltage
B. Photovoltaic
C. Phase Variable
D. Primary Voltage
Correct Answer: B. Photovoltaic
Rationale:
Photovoltaic refers to the process of converting sunlight directly into electricity
using solar cells. It is the fundamental technology used in solar electric systems.
The other options are not standard meanings of PV in the solar industry.
Question 2
Which component converts DC electricity into AC electricity?
A. Charge controller
B. Inverter
C. Combiner box
D. Disconnect switch
Correct Answer: B. Inverter
Rationale:
An inverter changes direct current (DC) from solar panels into alternating current
,(AC), which is used by most homes and businesses. Charge controllers regulate
battery charging, combiner boxes combine circuits, and disconnect switches
isolate equipment.
Question 3
Solar photovoltaic modules produce what type of electricity?
A. Alternating current (AC)
B. Direct current (DC)
C. Three-phase AC
D. Variable frequency AC
Correct Answer: B. Direct current (DC)
Rationale:
Solar modules naturally generate direct current (DC). An inverter is required to
convert this electricity into alternating current (AC) for most electrical loads.
Question 4
Which instrument measures electrical voltage?
A. Ammeter
B. Ohmmeter
C. Voltmeter
D. Thermometer
Correct Answer: C. Voltmeter
Rationale:
A voltmeter measures electrical potential difference (voltage). Ammeters
measure current, ohmmeters measure resistance, and thermometers measure
temperature.
Question 5
,What is the primary purpose of an inverter?
A. Increase battery capacity
B. Convert DC power to AC power
C. Reduce panel temperature
D. Store solar energy
Correct Answer: B. Convert DC power to AC power
Rationale:
The inverter converts DC electricity produced by solar panels into AC electricity
suitable for homes and the utility grid.
Question 6
Which unit measures electrical power?
A. Volt
B. Ampere
C. Watt
D. Ohm
Correct Answer: C. Watt
Rationale:
A watt is the standard unit of electrical power and represents the rate at which
electrical energy is used or produced.
Question 7
Which unit measures electrical current?
A. Volt
B. Ampere
C. Watt
D. Ohm
Correct Answer: B. Ampere
, Rationale:
Electrical current is measured in amperes (amps). Voltage is measured in volts,
resistance in ohms, and power in watts.
Question 8
Which unit measures electrical resistance?
A. Watt
B. Volt
C. Ampere
D. Ohm
Correct Answer: D. Ohm
Rationale:
Resistance opposes the flow of electrical current and is measured in ohms (Ω).
Question 9
What device protects a circuit from excessive current?
A. Inverter
B. Transformer
C. Circuit breaker
D. Combiner box
Correct Answer: C. Circuit breaker
Rationale:
A circuit breaker interrupts current flow when excessive current is detected,
protecting equipment and wiring from damage.
Question 10
What is the main function of a combiner box?
