### Electrical potential

- It is defined as the work done in bringing a unit positive charge from infinity to a particular point in the electric field.

Electric field =
work done / Electric charge

- The unit of work done is joule and charge is coulomb.
- The unit of electrical potential is joule per coulomb.
- One volt = one joule per coulomb

### Potential difference

- The electric potential difference between any two point A and B in an electrical field is equal to work done to move a unit positive charge from point A to point B against the electric force due to electric field.
- Potential difference = Work done / Charge
- If the potential
at point A is V
_{A}and that of potential of point B is V_{B}, the potential difference between point A and B

= Potential of
final point B – Potential of initial point A

= V_{B} –
V_{A}

= W / Q

- Let V
_{B}– V_{A}= V

### Unit of Potential difference

- The SI unit of potential difference is volt or Joule per Coulomb.

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