Electrical Contractor Electrical Theory & Fundamentals Flashcards
6 cards from real Licensed Electrical Contractor practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Electrical Contractor Electrical Theory & Fundamentals flashcards as text
What happens to the total current in a parallel circuit when an additional branch is added?
Answer: Total current increases
Adding a parallel branch provides an additional path for current flow, which increases the total circuit current.
A single-phase motor draws 15 amps at 208 volts with a power factor of 0.85. What is the true power consumed?
Answer: 2,652 watts
True power equals V × I × PF, so 208 × 15 × 0.85 = 2,652 watts.
According to Kirchhoff's Voltage Law, what is the sum of all voltage drops and rises around any closed loop?
Answer: Zero
Kirchhoff's Voltage Law states that the algebraic sum of all voltages around any closed loop in a circuit equals zero.
What is the unit of measurement for electrical capacitance?
Answer: Farad
The farad is the SI unit of capacitance, named after physicist Michael Faraday.
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?
Answer: 0.63 ohms
Resistance is proportional to length: 2.525 × (250 ÷ 1,000) = 0.63 ohms.
In a three-phase system, what is the phase angle between each phase?
Answer: 120 degrees
Three-phase power distributes its phases equally across 360 degrees, placing each phase 120 degrees apart.