A Level Physics Practice Exam

Ohm's law fundamentally describes how current and potential difference (voltage) are related in a conducting material, specifically highlighting that when a conductor is at a constant temperature, the current flowing through it is directly proportional to the potential difference applied across its ends. This means that if you increase the voltage, the current flowing through the conductor also increases, provided the temperature remains constant. This linear relationship can often be expressed mathematically as V = I × R, where V is the potential difference, I is the current, and R is the resistance.

In practical terms, this relationship allows for predictable behavior in electrical circuits, making it fundamental in the study and application of electrical engineering. Understanding this concept is crucial, as it provides a foundational basis for analyzing various electrical systems and components, whether in simple circuits or complex designs.