IMathAS-libretexts

A student has a collection of resistors made of the same material and wants to experimentally determine the effect of a resistor's geometry on its resistance. The student connects each different resistor in the circuit shown above, using the same other components. Which of the following indicates quantities to measure that will provide useful information and explains why the information is useful?

The current through and potential difference across each resistor, because the resistance of the resistors can then be determined.
The potential difference across each resistor and each resistor's dimensions, because the resistance of the resistors can then be determined and analyzed as a function of its dimensions.
The current through each resistor and each resistor's dimensions, because the resistance of the resistors can then be determined and analyzed as a function of its dimensions.
The current through and potential difference across each resistor and each resistor's dimensions, because the resistance of the resistors can then be determined and analyzed as a function of its dimensions.

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