 # Define potential difference between two points

Potential difference between any two points is defined as the amount of work done in moving a unit charge from one point to another

$$\begin{array}{l}dv = \frac{dw}{dq}\end{array}$$

The potential difference between points A and B, VB-VA, is defined as the shift in the potential energy of a charge q, divided by the charge, shifted from A to B. Joules per coulomb, given the term volt (V) after Alessandro Volta, are units of potential difference.

Point 1:

If a positive charge is moved from a point at a higher potential to a point at a lower potential energy is liberated.

Point 2:

In actual practice electric charge moves from lower potential to higher potential here there is a loss of energy by electrons moving from lower potential to higher potential the loss of energy appears as heat.

### Unit of potential difference

The unit of potential difference is volt.

$$\begin{array}{l}1\, volt = \frac{1\,joule}{coulomb}\end{array}$$ (301) (63)