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4,000 volt power supply (microwave transformers)

This shows how I connected 2 microwave transformers in series for a 4,000 volt power supply I built earlier. I used a light bulb to limit current. When an arc is drawn from a transformer, it shorts out the transformer. This cancels out the inductive reactance on the primary winding because of mutual inductance, and you'll see the light bulb get a lot brighter. When the transformer is unloaded (no arc), the light bulb is actually dimmer than normal because the transformers' primary windings add impedance. But when you draw an arc, it shorts out the transformer and cancels out the inductive reactance on the primary circuit. This means less resistance, so the light bulb gets brighter. You can see why you need something to limit current! When you draw an arc from the transformer, it causes a current surge.