ElectricDevicesandSystemsAlthoughtransformershavenomovingparts,,,theycanprovidematchingofimpedances,,mostprobablymadewithcopper,,andthewholeassemblymaybeimmersedininsulatingoil,usedtobothincreasethedielectricstrengthofthepaperandtotransferbeatfromthecore-,,,onewithN1andtheotherwithN2turns,:ifthefluxinthecorechanges,inducingavoltageinthecoils,andthedottedterminalofonecoilispositivewithrespectitsotherterminal,,thecorollarytothis,currentintodottedterminalsproducesfluxinthesamedirection,,,i1intothedottedterminalofcoil1,,,-worktha
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