Physics
Siphon will fail to work if:

The temperature of the liquids in the two vessels are the same.
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.

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Physics
A dynamo is used to convert

Electrical energy into magnetic energy
Electrical energy into mechanical energy
Magnetic energy into mechanical energy
Mechanical energy into electrical energy

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