Voltage current, KW,KVA,KVAR, basics in Tamil Link
https://youtu.be/0WyMTQH6pz8

Difference between AC current and DC current with easy example in Tamil
Positive half cycle, negative half cycle and complete cycle explanation for easy understanding of frequency
Different between single phase and three phase system, Line voltage phase voltage, three phase four wire system, why we tell natural is return path of the electrical supply

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