Do you know, our house bulbs are switched on-off 100 times in one second?  The reason is AC.  Let us explore.      Take a cell in a remote device.  It supplies a steady 1.5 volt.  Here current flows in only one direction.  That is, the negative electrons flow from negative to positive.  And the conventional current said to flow from positive to negative.  This is what is called direct current or DC.&nb...

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kannan narayanan

blogs from Tiruchirappalli