- It is a fundamental property of an atom. It may be positive or negative.
- Like charges repel each other and opposite charges attract.
Where, Q = Charge(total), n = No. of electrons, e = Charge on 1 electron
CurrentThe current is defined as the rate of flow of charge through a particular conductor. The SI unit of current is Ampere (A). The device to measure current is Ammeter. The connection of an ammeter in an electric circuit is as shown below:
Important points to measure current:
- Ammeter has low resistance and is always connected in series.
- The direction of current is taken opposite to the flow of electrons as electrons.