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Electrical Circuits and Ohm's Law 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.

Read the first 7 Electrical Circuits and Ohm's Law flashcards as text

  1. A fuse is rated at 5 A. What is its primary function in a circuit?

    Answer: Protect against excessive current

    A fuse melts and breaks the circuit if current exceeds its rated value, protecting components.

  2. Three 12 Ω resistors are connected in parallel. What is the equivalent resistance?

    Answer: 4 Ω

    For N equal resistors in parallel, R_eq = R/N = 12/3 = 4 Ω.

  3. How much energy does a 100 W appliance use in 2 hours?

    Answer: 720,000 J

    Energy = Power × Time = 100 W × 7200 s = 720,000 J.

  4. Which circuit configuration ensures that all components receive the same voltage?

    Answer: Parallel circuit

    In a parallel circuit, each branch is connected directly to the source, so all branches share the same voltage.

  5. A 5 Ω and 20 Ω resistor are in series with a 50 V source. What is the voltage drop across the 20 Ω resistor?

    Answer: 40 V

    Total R = 25 Ω; I = 50/25 = 2 A; V = 2 × 20 = 40 V across the 20 Ω resistor.

  6. What is the relationship between resistance and the cross-sectional area of a conductor?

    Answer: Resistance decreases as area increases

    A larger cross-sectional area provides more paths for electrons, reducing resistance.

  7. A device draws 2 A at 110 V for 30 minutes. How many watt-hours of energy does it consume?

    Answer: 110 Wh

    Power = I × V = 2 × 110 = 220 W; Energy = 220 W × 0.5 h = 110 Wh.