Transformator Laboratory. Ideal transformer. The winding resistance are negligibele All fluxes are confined to the core i.e no leakage flux Core losses are asumed to be negligible Permeability of the iron core is infinite Im=0. Polarity.
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The dot mark means that the currents entering these terminals produce fluxes in the same direction in the core. Common time varying flux linking both windings will induce a voltages in such a way that in any instance of time when terminal 1 is positive the terminal 3 will also be positive. Voltages e12 and e34 are in phase.