Lesson: Chapter 19 — Current Electricity

19.5. What changes resistance 2 of 5 Reset answers

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Question 2

What happens to the resistance of a wire as its cross-sectional area increases?

A It first rises and then falls B It does not change C It increases D It decreases

The right answer is the one marked above.

It decreases. A thicker conductor offers less obstruction, so the current passes more easily. Wires 1, 2 and 3 of activity 19.4 showed this.

Mains cables carrying a large current are made thick for exactly this reason.

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