> [!summary] Potential difference, often called voltage, is a quantity that tells us how much energy per unit of charge is transferred. > Key equation: > Potential difference: $\Delta V = \frac{W}{q}$ >[!info]+ Read Time **⏱ 1 min** # Definition Potential difference, often called voltage, is a physical quantity that tells us how much energy per unit of charge is being transferred between two points. Mathematically, it's described as work done per charge $ \Delta V = \frac{W}{q} $ In circuits, when referring to voltage, we mean the potential difference between two points. For example, in [[Batteries|batteries]], the voltage is the potential difference between the two terminals of the battery. We often define voltage or potential difference in circuits just as V, or volts. # Resources <iframe width="560" height="315" src="https://www.youtube.com/embed/mFEyGiizEbw?si=6DGeaErWFDnX-Umu" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe> --- > 📂 Want to see more structured notes like these? > Help grow the project by [starring Math & Matter on GitHub](https://github.com/rajeevphysics/Obsidian-MathMatter). ---