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DC Circuits Fundamentals 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 10Ω, 20Ω, and 30Ω are connected in parallel. What is the equivalent resistance?

    Answer: 5.45Ω

    For parallel resistors, 1/Req = 1/10 + 1/20 + 1/30 = 6/60 + 3/60 + 2/60 = 11/60, so Req ≈ 5.45Ω.

  2. A 12V battery with an internal resistance of 0.5Ω supplies current to a 5.5Ω external resistor. What is the terminal voltage?

    Answer: 11V

    Current = 12V / (0.5 + 5.5) = 2A; terminal voltage = 12 - (2 × 0.5) = 11V.

  3. Which law states that the algebraic sum of all currents entering and leaving a node equals zero?

    Answer: Kirchhoff's Current Law

    Kirchhoff's Current Law (KCL) states that the sum of currents into a node equals the sum of currents out of the node.

  4. A circuit has a 24V source with two resistors in series: 6Ω and 18Ω. What is the voltage across the 18Ω resistor?

    Answer: 18V

    Using the voltage divider: V18 = 24 × (18 / (6+18)) = 24 × 0.75 = 18V.

  5. What happens to total resistance when additional resistors are added in parallel to a circuit?

    Answer: Total resistance decreases

    Adding parallel paths provides more routes for current flow, which always decreases total equivalent resistance.

  6. A 100Ω resistor dissipates 4W of power. What current flows through it?

    Answer: 0.2A

    Using P = I²R, I = √(P/R) = √(4/100) = √0.04 = 0.2A.

  7. In a series circuit with a 9V battery and three equal resistors, each resistor drops which voltage?

    Answer: 3V

    In a series circuit, voltage divides equally across identical resistors: 9V / 3 = 3V each.