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

7 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. What is the equivalent resistance of three 12 Ω resistors connected in parallel?

    Answer: 4 Ω

    For identical resistors in parallel, R_total = R/n = 12/3 = 4 Ω.

  2. A 9 V battery is connected to a circuit. The current measured is 0.5 A. What is the resistance?

    Answer: 18 Ω

    R = V/I = 9/0.5 = 18 Ω.

  3. Which component in a circuit is used to protect against excess current?

    Answer: Fuse

    A fuse contains a wire that melts and breaks the circuit when current exceeds a safe level.

  4. In a circuit, voltage is 15 V and power consumed is 45 W. What is the current?

    Answer: 3 A

    Using P = VI, I = P/V = 45/15 = 3 A.

  5. What is the SI unit of electric current?

    Answer: Ampere

    Electric current is measured in Amperes (A), named after André-Marie Ampère.

  6. A 100 Ω resistor and a 400 Ω resistor are in parallel across a 20 V source. What is the total current from the source?

    Answer: 0.25 A

    I₁ = 20/100 = 0.2 A; I₂ = 20/400 = 0.05 A; total = 0.25 A.

  7. Which of the following increases the electrical resistance of a wire?

    Answer: Increasing the wire's length

    Resistance is directly proportional to length (R = ρL/A), so a longer wire has greater resistance.