When the electric current increases, does the resistance increases or decrease?

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Solution

Usually, the resistance of a substance is independent of voltage and current. But when a high magnitude of current is passed through a resistance for a long time, the heat generated will increase the temperature of the substance resulting in an increase of resistance. The temperature dependence of resistance is given by:
$R = R_{o} (1 + α (T - T_{o}))$
Where $R_{o}$ is the resistance at reference temperature $T_{o}$

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