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  4. Of the following graphs, the one that correctly represents the I-V. characteristics of a ‘Ohmic device’ is

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Q. Of the following graphs, the one that correctly represents the $I-V$. characteristics of a ‘Ohmic device’ is

KCETKCET 2017Current Electricity

Solution:

Ohmic devices obey ohm's law $V=I R$
where $R$ is constant.
$
\Longrightarrow I \propto V
$
Thus $I-V$ characteristics is a straight line having a non-zero slope passing through origin.