The terminals of a battery are connected by a certain length of resistance wire. Which of the following, on its own, will decrease the current flowing through the battery?

Connecting an identical wire in series with the first wire

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Covering the wire with plastic insulation

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Using a shorter wire of identical material and thickness

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Using a thicker wire of identical material and length

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Solution

The correct option is A Connecting an identical wire in series with the first wire
According to the formula I=V/R, Resistance is inversely proportional to current. So when another resistance wire is placed in series with the first, the total resistance of the circuit increases. And when resistance increases, the current decreases.

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