Physics
A transformer

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

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Physics
Siphon will fail to work if:

Both its limbs are of unequal length.
The densities of the liquid in the two vessels are equal.
The level of the liquid in the two vessels are at the same height.
The temperature of the liquids in the two vessels are the same.

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