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jim hardy
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#8
Mar12-12, 12:40 PM
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P: 3,149
An ideal transformer with open secondary would approximate an inifinite inductance
ie its primary would draw no magnetizing current.
and any load connected to the secondary could be represented as a load in parallel with primary .

A real transformer has imperfect core hence finite inductance so draws a small magnetizing current .

At any instant the energy stored in an inductor is [itex]LI^{2}/2[/itex]
and phyzguy's explanation above is 'spot on' .

Does that help?