**Electric Voltage:**

Electric Voltage states that, according to the structure of an atom, we know that there are two types of charges: **Positive** and **Negative**. A force of attraction exists between these positive and negative charges. A certain amount of energy (work) is required to overcome the force and move the charges through a specific distance.

All opposite charges possess a certain amount of potential energy because of the separation between them. The difference in potential energy of the charges is called the **Potential Difference**.

Potential Difference in electrical terminology is known as Electric Voltage, and is denoted either by V or υ. It is expressed in teams of energy (W) per unit charge (Q); i.e.

where

**dw is the small change in energy,****dq is the small change in charge,****energy (W) is expressed in joules (J),****charge (Q) in coulombs (C), and****voltage (V) in volts (V).**

**Define One Volt:**

One volt is the potential difference between two points when one joule of energy is used to pass one coulomb of charge from one point to the other.