If a circuit has a voltage of 12 V and a resistance of 3 Ω, what is the current?

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Study for the AAMI Certified Associate in Biomedical Technology Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

If a circuit has a voltage of 12 V and a resistance of 3 Ω, what is the current?

Explanation:
Current is found using Ohm's law: I = V / R. With a voltage of 12 V across a resistance of 3 Ω, the current is 12 / 3 = 4 A. This result directly reflects the given values. If the current were 3 A, the voltage would be I × R = 9 V; if it were 6 A, the voltage would be 18 V; if it were 12 A, the voltage would be 36 V. So 4 A is the correct match for the supplied voltage and resistance.

Current is found using Ohm's law: I = V / R. With a voltage of 12 V across a resistance of 3 Ω, the current is 12 / 3 = 4 A. This result directly reflects the given values. If the current were 3 A, the voltage would be I × R = 9 V; if it were 6 A, the voltage would be 18 V; if it were 12 A, the voltage would be 36 V. So 4 A is the correct match for the supplied voltage and resistance.

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