Electric current in a metallic wire is due to the flow of electrons. Although there are large numbers of free electrons in a metallic wire, yet no electric current flows in the wire if wire is not connected across the battery, why? Explain this concept.
Answers
Explanation:
Why not flow :
,If the conductor is not connected to battery then there is no electric current flow in conductor because there is no potential difference across the conductor .
How current flow in conductor ( wire ) :
If conductor is connected to battery and circuit is closed then current flow because battery provide the potential difference so current flow .
Simple example to explain it :
Take a two small glass container and fill with unequal level of water on both and placed it on table , can the water move form one container to another without any medium between them No!.
So there is a requirement of a medium ( small pipe ) which placed between the two container then water flow form high potential ( higher level of water ) to lower potential ( lower level of water ) .
This phenomena also happened in current flowing when battery is connected to conductor , then current flow from high potential ( positive terminal ) to low potential ( negative terminal ).
Hear :
Positive terminal and negative terminal refer to terminal of battery.
Hope you understand it .
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Thank you