A Level Physics Practice Exam - 2026 Practice Test & Study Guide

In an ohmic conductor, the relationship between voltage and current is defined by Ohm's Law, which states that the voltage across a conductor is directly proportional to the current flowing through it. Mathematically, this relationship is expressed as V = IR, where V is the voltage, I is the current, and R is the resistance of the conductor, which remains constant for ohmic materials. This proportionality indicates that if the current through the conductor increases, the voltage will also increase in a linear fashion, assuming resistance does not change.

This direct proportionality reflects how ohmic conductors obey this simple linear relationship, making it a fundamental principle in electrical circuits. If you double the current, the voltage will also double, illustrating that the two quantities are tightly linked in a predictable manner.