Which of the following graphs best represents Ohm’s Law for a resistor at constant temperature?
A straight line graph passing through the origin when current is plotted against voltage
Ohm's law states that, at constant temperature, the current I through a conductor is directly proportional to the potential difference V across it: V = IR, so I = V/R.
Since R is constant, I and V are in direct proportion; when V = 0, I = 0, so the I–V graph is a straight line passing through the origin with slope 1/R.
A curved line indicates a non-ohmic device, and a line not passing through the origin would mean current flows with zero voltage.
Hence, the answer is A straight line graph passing through the origin when current is plotted against voltage.
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