Lesson: Chapter 19 — Current Electricity

19.5. What changes resistance 3 of 5 Reset answers

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Question 3

What happens to the resistance of a wire as its length increases?

A It does not change B It depends on the current C It decreases D It increases

The right answer is the one marked above.

It increases. A longer conductor is a longer path for the current to be opposed along. Wires 5, 6 and 7 of activity 19.4 showed this.

Length and thickness pull in opposite directions, which is worth noticing: longer means more resistance, thicker means less.

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