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RCDD · Question #132

RCDD Question #132: Real Exam Question with Answer & Explanation

The correct answer is B. 8. Ohm's Law states I = V/R, so dividing 120 volts by 15 ohms gives exactly 8 amps of current.

Question

Using Ohms law, a circuit of 120 volts and a resistance of 15 ohms will have a current of ________ amps.

Options

  • A5
  • B8
  • C10
  • D12
  • E15

Explanation

Ohm's Law states I = V/R, so dividing 120 volts by 15 ohms gives exactly 8 amps of current.

Common mistakes.

  • A. 5 amps would require a resistance of 24 ohms (120/24 = 5), not the 15 ohms specified in the problem.
  • C. 10 amps would require a resistance of 12 ohms (120/12 = 10), not 15 ohms.
  • D. 12 amps would require a resistance of 10 ohms (120/10 = 12), not 15 ohms.
  • E. 15 amps would require a resistance of 8 ohms (120/8 = 15), and this choice likely serves as a distractor by matching the resistance value numerically to a current answer.

Concept tested. Ohm's Law - solving for current given voltage and resistance

Reference. https://www.allaboutcircuits.com/textbook/direct-current/chpt-2/voltage-current-resistance-relate/

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