The reason of current flow in a metallic wire is the flow of free electrons present in it. When a metallic wire is not connected to a source of electricity the electrons present in it are free to move in all directions. As a result, there is no net flow of current in the wire.
But, if the metallic wire is connected to a source of electricity, the electrons present in wire start to move from negative terminal to positive terminal. This flow of electrons in the wire from negative terminal to positive terminal is responsible for current flow inside a wire
Test Your Understanding and Answer These Questions:
- How does current flow inside a wire?