Which of these will cause the resistance of a conductor to decrease?

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Enhance your understanding of the fundamentals of electricity with the AMT General Exam. Study with multiple-choice questions crafted to improve your knowledge and confidence. Prepare effectively for your success!

Multiple Choice

Which of these will cause the resistance of a conductor to decrease?

Explanation:
Resistance changes with length and cross-sectional area: it increases with longer length and decreases with larger cross-sectional area, described by R = ρL/A. Shortening the conductor reduces the path electrons travel, and increasing the cross-sectional area provides more paths for current, lowering resistance. So decreasing the length or increasing the cross-sectional area both lead to a smaller resistance. The other options involve actions that would typically raise resistance (reducing cross-section) or don’t guarantee a decrease (increasing length with area that may or may not offset), so they don’t reliably reduce R.

Resistance changes with length and cross-sectional area: it increases with longer length and decreases with larger cross-sectional area, described by R = ρL/A. Shortening the conductor reduces the path electrons travel, and increasing the cross-sectional area provides more paths for current, lowering resistance. So decreasing the length or increasing the cross-sectional area both lead to a smaller resistance. The other options involve actions that would typically raise resistance (reducing cross-section) or don’t guarantee a decrease (increasing length with area that may or may not offset), so they don’t reliably reduce R.

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