A student connects a resistor to a battery and measures the current at different voltages. The results show that as voltage doubles, the current also doubles. What can the student conclude?

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Question

A student connects a resistor to a battery and measures the current at different voltages. The results show that as voltage doubles, the current also doubles. What can the student conclude?

Accepted Answer

B. The resistor obeys Ohm's Law since current is directly proportional to voltage. — When current doubles as voltage doubles, the ratio V/I remains constant, meaning resistance is constant. This is the defining characteristic of an ohmic conductor obeying Ohm's Law. Options A and C misinterpret the proportional relationship.

Answer

A. The resistor is non-ohmic because its resistance is changing.

Answer

D. The resistor acts as a source of electromotive force in the circuit.

Answer

C. The resistance of the circuit is decreasing as voltage increases.

Answer

B. The resistor obeys Ohm's Law since current is directly proportional to voltage.

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