Current through a metallic conductor | 12th class physics | physics ka safar

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In this video I have discussed the basic concepts of current through a metallic conductor
The queries solved in this video are
1. what is free electron?
2. What type of charge carriers used in metallic conductor?
3. How the current produce in a metallic wire?
4. What is drift velocity of free electrons?
5. What is thermal energy?
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