**Potential difference**

**A gravitational analogy can be used to explain electric potential difference. Moving a positive charge against the direction of an electric field is like moving a coconut upwards within Earth’s gravitational field. Both movements require work down by an external force. This work would in turn increase the potential energy of the object.**

An object will move from a place of high potential energy to a place of low potential energy. The potential energy of water at the top of a waterfall is greater than at the bottom.

As a result, water flows from the top to the bottom of the waterfall. Similarly, positive charge will move from a point which has a higher electrical potential to a point which has a lower electrical potential.

The potential difference, V, between two points in a circuit is

**defined as the amount of work done, W, when one coulomb of charge passes from one point to the other point.**

Potential difference = work done / quantity of charge

or amount of work done is W = QV

The SI unit for potential difference is volt, V.

One volt is one joule of work done to move 1 coulomb of charge from one point to another in an electric field.

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