Ideal Transformers
What happens when we connect a resistive load to the secondary coil?
- Flux produced by primary coil induces an emf in secondary
- This changing flux appears in the primary circuit as well; the sense of it is to reduce the emf in the primary...
- However, V1 is a voltage source.
- Therefore, there must be an increased current i1 (supplied by the voltage source) in the primary which produces a flux µ N1i1 which exactly cancels the flux produced by i2.
- emf in secondary produces current i2
- This current produces a flux in the secondary coil µ N2i2, which opposes the original flux -- Lenz’s law