Physics
We always see the same face of the moon, because

It is smaller than the earth
It takes equal time for revolution around the earth and rotation on its own axis
It rotates at the same speed as the earth around the sun
It revolves on its axis in adirection opposite to that ofthe earth

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Physics
A transformer

Converts electrical energy into mechanical energy
Is used to decrease or increase AC voltage
Converts DC to AC
Converts AC voltage to D.C. voltage

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