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Answer Posted / sethu raman
trasnformer is on inducton principle. when we supply input
to the primary winding the flux will produce in primary
wining and that flux cuts the secondary winding. due to
this emf the voltage will produce in the secondary
windings. the out put of the secondary will depends on the
secondary winding.when the primary winding is higher then
secondary that is step down trasformer.then the primary
winding is lower then secondary is called as step up
transformers.mostly step up trasformers are only used in
substations for transmitting power.
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