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.
Read the first 7 Electric Circuit Analysis flashcards as text
In a series RLC circuit at resonance, which statement is correct?
Answer: Impedance equals R only
At resonance, XL = XC, so they cancel and total impedance equals R alone.
Thevenin's theorem states that any linear circuit can be replaced by a:
Answer: Voltage source in series with a resistance
Thevenin's theorem reduces any linear network to an equivalent voltage source (Vth) in series with a resistance (Rth).
A capacitor of 100 μF is charged to 50 V. What is the energy stored?
Answer: 0.125 J
Energy = ½CV² = ½ × 100×10⁻⁶ × 50² = 0.125 J.
Which method uses node voltages as the primary unknowns to analyze a circuit?
Answer: Nodal analysis
Nodal analysis applies KCL at each node and solves for node voltages as the primary unknowns.
In an RL circuit with DC supply, the time constant τ is:
Answer: L/R
The time constant of an RL circuit is τ = L/R, representing the time to reach ~63.2% of the final current.
Two resistors R1 = 6 Ω and R2 = 12 Ω are connected in parallel. What is the equivalent resistance?
Answer: 4 Ω
Req = (R1 × R2)/(R1 + R2) = (6 × 12)/(6 + 12) = 72/18 = 4 Ω.
The superposition theorem is applicable only to circuits that are:
Answer: Linear and bilateral
Superposition applies exclusively to linear, bilateral circuits where responses to independent sources can be added individually.