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- Basic Math and Science Electrical Circuits and Ohm's Law Questions and Answers Flashcards

6 cards from real BMST 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. A circuit has a 9V battery and a 3Ω resistor. How much power is dissipated?

    Answer: 27W

    P = V²/R = 81/3 = 27W. Alternatively, I = 9/3 = 3A, then P = VI = 9 × 3 = 27W.

  2. What is the total resistance of two 6Ω resistors connected in parallel?

    Answer: 3Ω

    For parallel resistors: 1/R_total = 1/6 + 1/6 = 2/6 = 1/3, so R_total = 3Ω.

  3. What is the difference between AC and DC current?

    Answer: AC alternates direction; DC flows in one direction only

    AC (alternating current) reverses direction periodically, while DC (direct current) flows consistently in one direction.

  4. What device is used to measure current in a circuit?

    Answer: Ammeter

    An ammeter measures current and must be connected in series with the circuit.

  5. If a 60W light bulb operates at 120V, what current does it draw?

    Answer: 0.5A

    I = P/V = 60W/120V = 0.5A.

  6. What is a short circuit?

    Answer: An unintended low-resistance path that allows excessive current to flow

    A short circuit bypasses the normal load with a very low resistance path, causing dangerously high current.