NCEA Level 2 Electricity Practice Exam 2025 - Free Electricity Exam Questions and Study Guide

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How does an increase in voltage affect current if resistance is kept constant according to Ohm's Law?

Current decreases

Current increases

According to Ohm's Law, which is expressed as \( V = I \times R \) (where \( V \) is voltage, \( I \) is current, and \( R \) is resistance), if the resistance \( R \) is kept constant and the voltage \( V \) increases, the current \( I \) must also increase to maintain the equality. This direct relationship means that any change in voltage results in a proportional change in current when resistance does not vary.

In such scenarios, doubling the voltage will lead to doubling the current, illustrating that current increases in a linear relationship with voltage under constant resistance conditions. This principle is foundational in understanding electrical circuits and how they operate in response to changes in voltage and resistance.

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Current has no relation to voltage

Current oscillates

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