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Electrical Principles and Units Flashcards

7 cards from real GROL practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Electrical Principles and Units flashcards as text

  1. What is the resonant frequency of a circuit with L = 100 μH and C = 100 pF?

    Answer: 1.59 MHz

    f = 1/(2π√(LC)) = 1/(2π√(10⁻¹⁴)) ≈ 1.59 MHz.

  2. At resonance in a series RLC circuit, the total impedance equals:

    Answer: The resistance R alone

    At resonance XL = XC, they cancel, and impedance reduces to R alone.

  3. How is the Q factor of a series resonant circuit defined?

    Answer: Q = XL/R

    Q = XL/R, representing the ratio of reactance to resistance at resonance.

  4. A resonant circuit has a center frequency of 1 MHz and a 3-dB bandwidth of 10 kHz. What is its Q factor?

    Answer: 100

    Q = f₀/BW = 1,000,000/10,000 = 100.

  5. What is the RMS value of a sine wave with a peak voltage of 170 V?

    Answer: 120 V

    Vrms = Vpeak/√2 = 170/1.414 ≈ 120 V, which is standard US household voltage.

  6. In a purely capacitive AC circuit, the current phase relationship to voltage is:

    Answer: Current leads voltage by 90°

    In a pure capacitor, current leads voltage by exactly 90 degrees.

  7. Power factor is equal to:

    Answer: True power divided by apparent power

    Power factor = true power (watts) / apparent power (volt-amperes) = cos(θ).