The current-voltage graph of a conductor is a straight line passing through the origin. The conductor is most likely
Aa metallic wire at constant temperature.CORRECT
Ban electrolyte with polarisation.
Ca semiconductor diode.
Da filament lamp.
JUPEBPhysicsCurrent Electricity
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Why the answer is A, and why the others tempt you.
A straight line through the origin means current is directly proportional to voltage, which is Ohm's law, obeyed by a metal at constant temperature. A filament lamp curves as it heats up, and a diode conducts in one direction only.
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