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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 60 W light bulb operates at 120 V. What is its resistance?

    Answer: 240 Ω

    Using P = V²/R, R = V²/P = 14400/60 = 240 Ω.

  2. In a series circuit, which quantity remains the same throughout?

    Answer: Current

    In a series circuit, the same current flows through every component since there is only one path.

  3. What is the voltage drop across a 15 Ω resistor when 3 A flows through it?

    Answer: 45 V

    V = IR = 3 × 15 = 45 V.

  4. Which material is the best conductor of electricity?

    Answer: Copper

    Copper is an excellent conductor with very low electrical resistance, making it widely used in wiring.

  5. A circuit has a 12 V source and three equal resistors in series drawing 0.5 A. What is each resistor's value?

    Answer: 8 Ω

    Total R = V/I = 12/0.5 = 24 Ω; each of three equal resistors = 24/3 = 8 Ω.

  6. What does Kirchhoff's Voltage Law (KVL) state?

    Answer: The sum of voltage drops around a closed loop equals the source voltage

    KVL states that the algebraic sum of all voltages around any closed loop in a circuit equals zero.

  7. If a resistor's resistance doubles and the voltage across it stays the same, what happens to current?

    Answer: Current halves

    By Ohm's Law, I = V/R; doubling R with constant V cuts the current in half.