What is voltage ? This page offers an easy-to-understand explanation of how voltage differs from current, the units in which it is measured, and other information. Overview Before you start using electronic devices, you need to develop a good understanding of current, resistance, voltage , and related topics. If you’re like most people, you're familiar with the words but lack a detailed understanding of the underlying concepts. This page provides an easy-to-understand introduction that ... Voltage is an important parameter in circuits. It is the potential difference between the two charged points per unit charge in an electric field. In this article, we will discuss about voltage , voltage symbols, voltage units, voltage properties, voltage formulas, and types of voltages. We will also cover how to measure voltage . Learn what voltage is, how it relates to 'potential difference', and why measuring voltage is useful. Voltage is the pressure of the power source that exerts on an electrical circuit. And, the pressure pushes the charge electrons through a conducting loop. The movement of electrons sets up current in the electrical circuit. As a result, the work is done by the current in the presence of voltage .