Fundamental Circuit Analysis Flashcards

In the Norton equivalent circuit, the Norton current (I_N) is determined by:

Answer: Short-circuiting the load terminals and measuring current

I_N is the short-circuit current at the terminals of the original network.

A capacitor of 100 µF is charged to 12 V. How much energy is stored in it?

Answer: 7.2 mJ

E = ½CV² = ½ × 100×10⁻⁶ × 144 = 7.2×10⁻³ J = 7.2 mJ.

Which of the following correctly describes a node in circuit analysis?

Answer: A point where two or more circuit elements meet

A node is a junction point connecting two or more circuit elements, used to apply KCL.

For maximum power transfer from a source with internal resistance R_s to a load R_L, the condition is:

Answer: R_L = R_s

Maximum power is delivered to the load when R_L equals the Thevenin resistance R_th (source resistance R_s).

In mesh analysis, a mesh current is:

Answer: A hypothetical current circulating in a closed loop

Mesh currents are fictitious loop currents assigned to each independent mesh to set up KVL equations.

An inductor of 50 mH carries a current of 4 A. What energy is stored in it?

Answer: 400 mJ

E = ½LI² = ½ × 0.05 H × 16 A² = 0.4 J = 400 mJ.

The voltage divider rule applies when two resistors R1 and R2 are connected in:

Answer: Series across the source

The voltage divider rule gives V_R1 = V_s × R1/(R1+R2) only when R1 and R2 are in series.