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## 29/06/2021

### 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 VA and that of potential of point B is VB, the potential difference between point A and B

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

= VB – VA

= W / Q

• Let VB – VA = V

### Unit of Potential difference

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

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