Ohm's law states that, for an ohmic conductor at constant temperature:
A$V$ is independent of $I$
B$V \propto I^2$
C$V \propto \dfrac{1}{I}$
D$V \propto I$
Answer & Solution
Correct answer: D. $V \propto I$
Ohm's law: $V = IR$, where $R$ is constant for an ohmic conductor at fixed temperature. So $V$ is *directly proportional* to $I$ — the V–I graph is a straight line through the origin with slope $R$.
For non-ohmic conductors (diodes, transistors), $R$ depends on $V$ or $I$, and the graph isn't a straight line.
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