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Electric Circuit Analysis Flashcards

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

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  1. An inductor of 200 mH carries a current of 5 A. What is the energy stored?

    Answer: 2.5 J

    Energy = ½LI² = ½ × 0.2 H × (5)² = 0.1 × 25 = 2.5 J.

  2. In a purely inductive AC circuit, the current lags the voltage by:

    Answer: 90°

    In a purely inductive circuit, current lags voltage by 90° because the inductor opposes changes in current.

  3. The bandwidth of a series RLC resonant circuit is given by:

    Answer: BW = R/L

    Bandwidth BW = R/L (rad/s) for a series RLC circuit, representing the range of frequencies where power exceeds half the maximum.

  4. In a delta (Δ) to star (Y) conversion, the star resistance connected to terminal A is:

    Answer: (RAB × RCA)/(RAB + RBC + RCA)

    In Δ-to-Y conversion, RA = (RAB × RCA)/(RAB + RBC + RCA).

  5. What does the imaginary part of complex impedance represent?

    Answer: Reactance

    The imaginary part of impedance Z = R + jX is called reactance X, representing energy storage (inductive or capacitive).

  6. In a circuit with a dependent voltage source, which theorem requires special treatment?

    Answer: Thevenin's theorem (Rth calculation)

    When calculating Rth with dependent sources present, you must apply an external test source because simply deactivating independent sources doesn't eliminate dependent ones.

  7. The unit of admittance is:

    Answer: Siemens (S)

    Admittance Y = 1/Z is measured in Siemens (S), the reciprocal of ohms.