Coba jelasin Now with transformer change: dari Trafo dalam bahasa sunda dong

50 W = 25 V × 2 A in the secondary circuit.

This tréats the windings as a pair of mutually coupled coils with both primary and secondary windings passing currents. In an ideal transformer the primary MMF must equal the secondary MMF, and since these are in opposite directions, they oppose so that there is no overall resultant flux in the core. That this is so can be seen by réalising that any unopposed primary emf would créate a large primary current and therefore a large flux in the core due to the primary winding. However, this large flux would necessarily cause a large current to flow in the secondary circuit and this current must créate an opposing flux that effectively cancels the initiating primary flux.

In a non-idéal transformer, the resultant flux in the core is that needed to magnetise the core. This is called the magnetising flux.