Circuits and Resistance

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The resistance of a wire depends on its length l and on its cross-sectional area A.

The resistance is

• directly proportional to l and directly proportional to A

• directly proportional to l and inversely proportional to A

• inversely proportional to l and directly proportional to A

• inversely proportional to l and inversely proportional to A

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• D

• A

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• D

• A

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• the e.m.f. of the battery

• the length of the connecting wires

• the resistance of the resistor

• the temperature of the resistor

• a capacitor

• a closed switch

• an open switch

• a resistor of constant resistance

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• D

A student carries out an experiment to investigate the resistance of a resistor R. She takes a series of readings of potential difference (p.d.) and current, and plots of a graph of her results.

Which circuit should she use?

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• D