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OAR Mechanical Comprehension: Electricity Flashcards

7 cards from real OAR practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 OAR Mechanical Comprehension: Electricity flashcards as text

  1. Two resistors of 6Ω and 12Ω are connected in parallel. What is the equivalent resistance?

    Answer: 4Ω

    For parallel resistors, 1/R = 1/6 + 1/12 = 3/12, so R = 4Ω.

  2. A 100W light bulb operates on a 120V circuit. What current does it draw?

    Answer: 0.83A

    Using P = IV, I = P/V = 100/120 ≈ 0.83A.

  3. What happens to the total resistance when additional resistors are added in series?

    Answer: It increases

    In a series circuit, total resistance is the sum of all individual resistances, so it always increases as more resistors are added.

  4. Which material is the best electrical conductor?

    Answer: Silver

    Silver has the highest electrical conductivity of all metals, making it the best conductor.

  5. A circuit has a 9V battery and a single 3Ω resistor. What power is dissipated?

    Answer: 27W

    Using P = V²/R = 81/3 = 27W.

  6. What does a capacitor do in a DC circuit once fully charged?

    Answer: Blocks current flow

    A fully charged capacitor blocks DC current because its electric field opposes additional charge movement.

  7. If voltage doubles while resistance stays constant, what happens to power?

    Answer: Power quadruples

    Since P = V²/R, doubling voltage squares the effect, so power quadruples.