BICSI
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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