The energy transformation that is happening in this process is mechanical energy to chemical energy.
According to conservation of energy, energy can not be distroyed and cannot be created, but can only be transformed from one form to another.
The batteries of some flashlights can be charged by turning a handle. The energy transformation that is happening in this process is mechanical energy to chemical energy. The chemical energy will transform to electrical energy which will eventually transform to light energy.
The turning of the handle is mechanical and the energy in battery is chemical.
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