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DC Circuit Analysis Flashcards

7 cards from real ISCET 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. Three resistors of 6Ω, 12Ω, and 4Ω are connected in parallel. What is the equivalent resistance?

    Answer: 2Ω

    1/Req = 1/6 + 1/12 + 1/4 = 2/12 + 1/12 + 3/12 = 6/12, so Req = 2Ω.

  2. A 24V battery is connected to a 6Ω and 2Ω resistor in series. What is the voltage drop across the 6Ω resistor?

    Answer: 18V

    Total resistance is 8Ω; current = 24/8 = 3A; V = 3A × 6Ω = 18V.

  3. What happens to the total current in a parallel circuit when an additional branch is added?

    Answer: Total current increases

    Adding a branch lowers equivalent resistance, so total current from the source increases.

  4. A 100Ω resistor and a 900Ω resistor form a voltage divider across 10V. What is the voltage across the 100Ω resistor?

    Answer: 1V

    V = 10V × (100/1000) = 1V using the voltage divider formula.

  5. Using Kirchhoff's Voltage Law, the algebraic sum of all voltages around any closed loop equals:

    Answer: Zero

    KVL states that the sum of all EMFs and voltage drops around any closed loop must equal zero.

  6. A wire carrying 5A splits into two parallel paths, one drawing 2A. How much current flows through the other path?

    Answer: 3A

    By KCL, the sum of currents entering a node equals the sum leaving: 5A = 2A + I, so I = 3A.

  7. What is the power dissipated by a 10Ω resistor carrying 3A?

    Answer: 90W

    P = I² × R = (3)² × 10 = 9 × 10 = 90W.