How many types of current

1) Conduction current

The flow of current through metallic conductors is called conduction current.

If a small amount of e.m.f. is applied on the conductor then the free electrons start to move from one end to another in the metal by passing on through its atom and it is known as conduction current.

2) Displacement current

This type of current flows through insulators. Insulators do not have free electrons and thus the flow of conduction current through them is not possible. But on applying an e.m.f. on the insulators the electrons present in the outer most orbit of their atoms try to move to wards positive terminal body.

The flow of current through a capacitor is of displacement type.

3) Convection current

When a flow of current is setup between two electrodes placed in a vacuum or gas of liquid filled tube, it is known as convection current.

Chemical cells, spark gaps, thermionic tubes etc. are the examples of convection current.

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