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Electrical Theory Flashcards

6 cards from real TN LLE 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 Theory flashcards as text

  1. A 10 AWG copper conductor has approximately 1.21 ohms per 1,000 feet. What is the voltage drop for a 150-foot one-way run carrying 25 amperes?

    Answer: 9.08 volts

    Voltage drop = 2 x Length x Resistance per foot x Current = 2 x 150 x (1.21/1000) x 25 = 9.08V.

  2. What is the formula for calculating apparent power in a single-phase AC circuit?

    Answer: S = V x I

    Apparent power (S) in a single-phase circuit is simply voltage times current: S = V x I, measured in volt-amperes (VA).

  3. A motor nameplate reads 10 HP. What is the approximate wattage equivalent?

    Answer: 7,460 watts

    1 horsepower = 746 watts, so 10 HP = 10 x 746 = 7,460 watts.

  4. What happens to the total circuit current when you add a load in parallel to an existing circuit?

    Answer: Total current increases

    Adding a parallel load creates an additional current path, reducing total resistance and increasing total circuit current.

  5. What is the frequency of standard AC power in the United States?

    Answer: 60 Hz

    The standard power frequency in the United States is 60 Hz (60 cycles per second).

  6. In a balanced 3-phase system, what is the relationship between line voltage and phase voltage in a wye (Y) configuration?

    Answer: Line voltage = Phase voltage x 1.732

    In a wye configuration, line voltage equals phase voltage multiplied by the square root of 3 (approximately 1.732).