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

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  1. What is the total power dissipated by a 4 Ω resistor carrying 3 A of current?

    Answer: 36 W

    P = I²R = 3² × 4 = 9 × 4 = 36 W.

  2. Which of the following best describes an open circuit?

    Answer: A broken path that stops current flow

    An open circuit has a break in the path, preventing any current from flowing.

  3. In a parallel circuit, if one branch burns out, what happens to the other branches?

    Answer: They continue to operate normally

    In a parallel circuit, each branch has its own path, so other branches are unaffected by one branch failing.

  4. Three 6 Ω resistors are connected in series. What is the total resistance?

    Answer: 18 Ω

    Series total resistance = 6 + 6 + 6 = 18 Ω.

  5. What does a short circuit occur when?

    Answer: Current has a near-zero resistance path

    A short circuit occurs when current finds an unintended low-resistance path, causing dangerously high current flow.

  6. According to Ohm's Law, if resistance doubles while voltage stays constant, what happens to current?

    Answer: Current is halved

    Since I = V/R, doubling R while V is constant cuts I in half.

  7. A wire carries 2 A of current for 30 seconds. How much charge passes through it?

    Answer: 60 C

    Charge Q = I × t = 2 × 30 = 60 coulombs.