In step up votlage, Output votlage > Input votlage Output current < Input current
In step down transformer Output votlage < Input votlage Output current > Input current. Power and frequency remains almost constant in stepup or stepdown transformer.
Transformer is static device. two or more stationary electrical circuit mutually linked by magnetic circuit. assumptions of ideal transformer: 1. there are no losses. 2. whole magnetic flux constant no leakage. 3. permeability of core is infinite.
EXAMIANS