A large number of free electrons are present in metals. Why is there no current in the absence of electric potential across it?
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7
As noted by others, electric current is the net movement of free electrons in a particular direction, and it takes an electric field to make them move together. Otherwise their net motion is zero, which is a current of zero.
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Hey there!
The current is due to the flow of charge in a definite direction. In metals, the free electrons move in all directions in a zig-zag manner. Hence, there is no current in the metal. When potential difference is applied across the metal almost all the electrons Start moving opposite to the direction of the potential, hence current begins to flow.
:-)
The current is due to the flow of charge in a definite direction. In metals, the free electrons move in all directions in a zig-zag manner. Hence, there is no current in the metal. When potential difference is applied across the metal almost all the electrons Start moving opposite to the direction of the potential, hence current begins to flow.
:-)
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