Answer Posted / panks
ac means alternating current which is due to frequency,
without which emf will not get induced.
As per ur doubt, in case of DC, frequency is zero hence no
emf will be induced.There will be no emf on primary as well
as on secondary side due to which heavy primary current
leads to damage the primary winding & dc is constant due to
which no flux linkage changes will be there.
We r using the transformer for stepping up or down the
voltage, which is not possible in case of dc due to zero
emf.
Hence due to above reasons trafo doesn,t work on dc.
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