Full bridge rectifier.

Double (WTF). Instead of 220V, there should be a transformer winding, and instead of the DC current passing through the capacitor, it must go through the load at the output. That’s not a simplification, it’s nonsense.

Man reminds me of the day when a basic DC PSU was a heavy transformer, bridge rectifier, electrolytic capacitors and a voltage regulator. Then switching PSU came about.

Why doesn't the current form a loop? Why doesn't it go back the way it came?