CSLB C10 EXAM 3 ACTUAL TEST 2026/2027 WITH
COMPLETE ACCURATE QUESTIONS AND CORRECT
DETAILED ANSWERS (CORRECT VERIFIED
SOLUTIONS) A NEW UPDATED VERSION
|GUARANTEED PASS A+
1. What should an electrician do first when reviewing plans for a new electrical
installation?
A. Purchase all available materials
B. Review the plans, specifications, schedules, and site conditions
C. Energize the service
D. Install receptacles
Correct Answer: B
Rationale: Plans, specifications, schedules, and field conditions establish the scope and
requirements of the installation. Reviewing them first helps identify circuit requirements,
equipment locations, conductor requirements, and potential conflicts before work begins.
2. A 120-V load draws 15 A. What is its power consumption?
A. 1,200 W
B. 1,500 W
C. 1,800 W
D. 2,400 W
Correct Answer: C
Rationale:
P=V×I
P = 120 × 15 = 1,800 W.
3. A 240-V load consumes 4,800 W. What current does it draw?
A. 10 A
B. 15 A
C. 20 A
D. 30 A
,Correct Answer: C
Rationale:
I=P÷V
I = 4,800 ÷ 240 = 20 A.
4. What is the main purpose of a load calculation?
A. Determine the paint required
B. Determine electrical system capacity requirements
C. Determine conduit color
D. Determine labor uniforms
Correct Answer: B
Rationale: Load calculations help determine the required capacity of services, feeders,
conductors, overcurrent protection, and other electrical equipment.
5. When evaluating an existing electrical system for an additional load, which
should be checked?
A. Service capacity
B. Building paint
C. Window size
D. Flooring material
Correct Answer: A
Rationale: The existing service and distribution system must have sufficient capacity to
accommodate the proposed additional load safely.
6. Ohm's law can be expressed as:
A. V = IR
B. V = I + R
C. R = V + I
D. I = VR
Correct Answer: A
,Rationale: Ohm's law states V = I × R.
7. A 20-ohm load is connected to 100 V. What current flows?
A. 2 A
B. 5 A
C. 10 A
D. 20 A
Correct Answer: B
Rationale:
I = V/R
I = 100/20 = 5 A.
8. Which condition generally causes greater voltage drop?
A. Short conductor run
B. Low current
C. Long conductor run with significant current
D. Larger conductor
Correct Answer: C
Rationale: Voltage drop is affected by conductor resistance and current. Longer conductors
generally have greater resistance.
9. What document normally identifies circuits and their associated loads in a
panel?
A. Panel schedule
B. Purchase order
C. Payroll record
D. Safety meeting sheet
Correct Answer: A
Rationale: A panel schedule identifies circuits, loads, breakers, and other relevant panel
information.
, 10. What is the purpose of a material takeoff?
A. Determine required material quantities
B. Test insulation
C. Measure current
D. Energize equipment
Correct Answer: A
Rationale: A material takeoff identifies and quantifies materials required to complete a project.
11. Which information is most important when selecting electrical equipment?
A. Equipment ratings
B. Equipment color
C. Package design
D. Manufacturer advertisement
Correct Answer: A
Rationale: Voltage, current, frequency, phase, environmental rating, fault rating, and other
equipment characteristics must be compatible with the installation.
12. What does a one-line diagram primarily represent?
A. Simplified electrical distribution
B. Building landscaping
C. Plumbing drainage
D. Employee organization
Correct Answer: A
Rationale: One-line diagrams provide a simplified representation of electrical distribution
equipment and connections.
13. What is the purpose of electrical specifications?
COMPLETE ACCURATE QUESTIONS AND CORRECT
DETAILED ANSWERS (CORRECT VERIFIED
SOLUTIONS) A NEW UPDATED VERSION
|GUARANTEED PASS A+
1. What should an electrician do first when reviewing plans for a new electrical
installation?
A. Purchase all available materials
B. Review the plans, specifications, schedules, and site conditions
C. Energize the service
D. Install receptacles
Correct Answer: B
Rationale: Plans, specifications, schedules, and field conditions establish the scope and
requirements of the installation. Reviewing them first helps identify circuit requirements,
equipment locations, conductor requirements, and potential conflicts before work begins.
2. A 120-V load draws 15 A. What is its power consumption?
A. 1,200 W
B. 1,500 W
C. 1,800 W
D. 2,400 W
Correct Answer: C
Rationale:
P=V×I
P = 120 × 15 = 1,800 W.
3. A 240-V load consumes 4,800 W. What current does it draw?
A. 10 A
B. 15 A
C. 20 A
D. 30 A
,Correct Answer: C
Rationale:
I=P÷V
I = 4,800 ÷ 240 = 20 A.
4. What is the main purpose of a load calculation?
A. Determine the paint required
B. Determine electrical system capacity requirements
C. Determine conduit color
D. Determine labor uniforms
Correct Answer: B
Rationale: Load calculations help determine the required capacity of services, feeders,
conductors, overcurrent protection, and other electrical equipment.
5. When evaluating an existing electrical system for an additional load, which
should be checked?
A. Service capacity
B. Building paint
C. Window size
D. Flooring material
Correct Answer: A
Rationale: The existing service and distribution system must have sufficient capacity to
accommodate the proposed additional load safely.
6. Ohm's law can be expressed as:
A. V = IR
B. V = I + R
C. R = V + I
D. I = VR
Correct Answer: A
,Rationale: Ohm's law states V = I × R.
7. A 20-ohm load is connected to 100 V. What current flows?
A. 2 A
B. 5 A
C. 10 A
D. 20 A
Correct Answer: B
Rationale:
I = V/R
I = 100/20 = 5 A.
8. Which condition generally causes greater voltage drop?
A. Short conductor run
B. Low current
C. Long conductor run with significant current
D. Larger conductor
Correct Answer: C
Rationale: Voltage drop is affected by conductor resistance and current. Longer conductors
generally have greater resistance.
9. What document normally identifies circuits and their associated loads in a
panel?
A. Panel schedule
B. Purchase order
C. Payroll record
D. Safety meeting sheet
Correct Answer: A
Rationale: A panel schedule identifies circuits, loads, breakers, and other relevant panel
information.
, 10. What is the purpose of a material takeoff?
A. Determine required material quantities
B. Test insulation
C. Measure current
D. Energize equipment
Correct Answer: A
Rationale: A material takeoff identifies and quantifies materials required to complete a project.
11. Which information is most important when selecting electrical equipment?
A. Equipment ratings
B. Equipment color
C. Package design
D. Manufacturer advertisement
Correct Answer: A
Rationale: Voltage, current, frequency, phase, environmental rating, fault rating, and other
equipment characteristics must be compatible with the installation.
12. What does a one-line diagram primarily represent?
A. Simplified electrical distribution
B. Building landscaping
C. Plumbing drainage
D. Employee organization
Correct Answer: A
Rationale: One-line diagrams provide a simplified representation of electrical distribution
equipment and connections.
13. What is the purpose of electrical specifications?
