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RafaThe definition: "Electromagnetic induction is the production of voltage across a conductor situated in a changing magnetic field or a conductor moving through a stationary magnetic field." - wikipedia
Assuming the transformer is converting higher voltage electricity to lower voltage, the primary (high side) winding is energized by the power system. The highside winding being energized creates a magnetic field perpendicular to it. This magnetic field, in turn creates an electric field perpendicular to it, which causes current to flow in the secondary winding.
Number of turns in the primary vs. the secondary is equivalent to the multiple increase in current from primary to secondary.
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