Fundamental Circuit Analysis Flashcards

A current source of 5 A is connected in parallel with a 10 Ω resistor. What is the voltage across the resistor?

Answer: 50 V

Using Ohm's law, V = I × R = 5 A × 10 Ω = 50 V.

Which theorem states that any linear two-terminal network can be replaced by an equivalent voltage source in series with an impedance?

Answer: Thevenin's Theorem

Thevenin's Theorem replaces a complex linear network with a single voltage source (V_th) in series with a resistance (R_th).

In a series RLC circuit at resonance, which statement is TRUE?

Answer: Inductive reactance equals capacitive reactance

At resonance, X_L = X_C, causing the imaginary parts to cancel and impedance to be purely resistive (minimum).

Three resistors of 6 Ω, 3 Ω, and 2 Ω are connected in parallel. What is the equivalent resistance?

Answer: 1 Ω

1/R_eq = 1/6 + 1/3 + 1/2 = 1/6 + 2/6 + 3/6 = 1, so R_eq = 1 Ω.

According to the Superposition Theorem, when analyzing a circuit with multiple independent sources, you:

Answer: Activate one source at a time, deactivating others by replacing voltage sources with short circuits and current sources with open circuits

Superposition requires solving for each independent source alone, then summing all individual contributions.

What is the time constant (τ) of a series RC circuit with R = 4.7 kΩ and C = 10 µF?

Answer: 47 ms

τ = RC = 4700 Ω × 10×10⁻⁶ F = 0.047 s = 47 ms.

Kirchhoff's Voltage Law (KVL) is based on which fundamental principle?

Answer: Conservation of energy

KVL states that the algebraic sum of voltages around any closed loop is zero, reflecting conservation of energy.