Nate Electrical Practice Exam 2025 - Free Electrical Practice Questions and Study Guide

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What occurs to the resistance in a parallel circuit as more branches are added?

The total resistance increases

The total resistance remains unchanged

The total resistance decreases

In a parallel circuit, adding more branches effectively provides additional pathways for the current to flow. When branches are added, the overall conductance of the circuit increases because each new branch offers an alternative route for the current.

The relationship between resistance and conductance is inversely proportional; as conductance increases, total resistance decreases. This is governed by the formula for total resistance in parallel circuits, which is given by the reciprocal of the sum of the reciprocals of the individual resistances.

As more branches are added, each additional path allows more current to flow, reducing the total resistance of the circuit. Thus, with an increasing number of parallel branches, the total resistance continues to decrease, confirming that the correct answer is that the total resistance decreases.

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The total resistance becomes infinite

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