Licensed Electrical Contractor Electrical Contractor Electrical Theory & Fundamentals 3

Question 1

What happens to the total current in a parallel circuit when an additional branch is added?

Accepted Answer

Total current increases

Answer

Adding a parallel branch provides an additional path for current flow, which increases the total circuit current.

Question 2

A single-phase motor draws 15 amps at 208 volts with a power factor of 0.85. What is the true power consumed?

Accepted Answer

2,652 watts

Answer

True power equals V × I × PF, so 208 × 15 × 0.85 = 2,652 watts.

Question 3

According to Kirchhoff's Voltage Law, what is the sum of all voltage drops and rises around any closed loop?

Accepted Answer

Zero

Answer

Kirchhoff's Voltage Law states that the algebraic sum of all voltages around any closed loop in a circuit equals zero.

Question 4

What is the unit of measurement for electrical capacitance?

Accepted Answer

Farad

Answer

The farad is the SI unit of capacitance, named after physicist Michael Faraday.

Question 5

A 14 AWG copper conductor has a resistance of approximately 2.525 ohms per 1,000 feet. What is the approximate resistance of a 250-foot run?

Accepted Answer

0.63 ohms

Answer

Resistance is proportional to length: 2.525 × (250 ÷ 1,000) = 0.63 ohms.

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