Physics
The wall of a dam is made thicker at the bottom than at the top because the pressure exerted by the water on the wall

Depends on the area of the wall
Depends on the thickness of the wall
Increases with height of the wall
Increases with depth of the wall

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Physics
A transformer

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

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