IGCSE Physics Practice Exam 2026 - Free International General Certificate of Secondary Education Practice Questions and Study Guide

When the voltage in a circuit increases while the resistance remains constant, the current also increases. This relationship is described by Ohm's Law, which states that current (I) is directly proportional to voltage (V) and inversely proportional to resistance (R), expressed mathematically as I = V/R.

If resistance does not change, increasing the voltage means that more potential difference is applied across the circuit. As a result, more electric charge moves through the circuit per unit time, which manifests as an increase in current. This fundamental principle underpins many electrical applications, illustrating how voltage adjustments can directly affect current flow in a circuit.

The other potential outcomes, such as current decreasing, remaining the same, or becoming zero, would not align with Ohm's Law under the condition of constant resistance. Increasing voltage inevitably results in a higher current, demonstrating the direct relationship between voltage and current in resistive circuits.