If voltage is held constant and resistance doubles, what happens to 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 voltage is held constant and resistance doubles, what happens to current?

Explanation:
With voltage held constant, current equals voltage divided by resistance (I = V/R). Doubling the resistance makes the denominator twice as large, so the current becomes half as large. For example, if V is 12 volts and R is 6 ohms, I is 2 amperes; increasing R to 12 ohms reduces I to 1 ampere. Therefore, the current is halved. The other options don’t fit because increasing resistance would not increase current, keep it the same, or produce a quadruple increase under a constant voltage.

With voltage held constant, current equals voltage divided by resistance (I = V/R). Doubling the resistance makes the denominator twice as large, so the current becomes half as large. For example, if V is 12 volts and R is 6 ohms, I is 2 amperes; increasing R to 12 ohms reduces I to 1 ampere. Therefore, the current is halved. The other options don’t fit because increasing resistance would not increase current, keep it the same, or produce a quadruple increase under a constant voltage.

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