CSLB C10 Electrical Contractor Practice
Examination Comprehensive Question Study Guide
Electrical Theory & Calculations
1. What is the minimum working clearance from an electrical panel under 600
V? ---ANSWER/✓ ---36"
2. Voltage drop in wire is a function of ---- - ✓✓ ANSWER---Wire gauge,
Length of wire, Current flow in the wire
3. A 12-volt direct current, 13-watt fluorescent light is controlled by a
photocell. The average daily on-time is 12 hours per day. How many watt-
hours are consumed by the light on an average day? ---- - ✓✓
ANSWER---156
4. 65 street lights are fed by a 2275-volt series circuit. What is the voltage
across each light? ---- - ✓✓ ANSWER---35 V
5. A 5 kW appliance is used for 5 hours. At $0.014 per kWh, the cost of
running the appliance is ---- - ✓✓ ANSWER---$0.35
6. For an electric appliance with a 17.5 A load, the overcurrent device must
not exceed ---- - ✓✓ ANSWER---25 amps
7. One million watts equals one ---- - ✓✓ ANSWER---Megawatt
Examination Comprehensive Question Study Guide
Electrical Theory & Calculations
1. What is the minimum working clearance from an electrical panel under 600
V? ---ANSWER/✓ ---36"
2. Voltage drop in wire is a function of ---- - ✓✓ ANSWER---Wire gauge,
Length of wire, Current flow in the wire
3. A 12-volt direct current, 13-watt fluorescent light is controlled by a
photocell. The average daily on-time is 12 hours per day. How many watt-
hours are consumed by the light on an average day? ---- - ✓✓
ANSWER---156
4. 65 street lights are fed by a 2275-volt series circuit. What is the voltage
across each light? ---- - ✓✓ ANSWER---35 V
5. A 5 kW appliance is used for 5 hours. At $0.014 per kWh, the cost of
running the appliance is ---- - ✓✓ ANSWER---$0.35
6. For an electric appliance with a 17.5 A load, the overcurrent device must
not exceed ---- - ✓✓ ANSWER---25 amps
7. One million watts equals one ---- - ✓✓ ANSWER---Megawatt
