In Isolated Transformer, the primary and secondary are separated yet when there is a demand for current in the secondary, the primary can produce current and transfer it via fluxes. I understood this a bit although I'd appreciate it if someone can share a youtube video of the principle because of this finding I had where when I used gaussmeter to measure the magnetic field, there was no difference between no load and with load as if the magnetic field was already maximum at the start.
Does this also occur in Autotransformer? I'm asking this because when I used a gaussmeter to measure magnetic field of an autotransformer, the no load and load magnetic field was the same. I was expecting the magnetic field to increase with load because there is more current and in an autotransformer, the secondary is just tap of different point of the continuous wire.. unless it's the same principle as the nonlocal flux transfer in isolated transformer? How?