In this video I explore the bi-toroid transformer. The transformer has 2 secondary coils and 1 primary. This gives the magnetic flux an alternate route to travel. When the two secondaries are under load you'll be using less power than if just 1 secondary was under load!
This does mean that the transformer is operating at over 100% efficiency. I was not the first person to discover this. I will provide links to other videos of people who managed to replicate this effect.
Here is a video by Thane Heinsvideo
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