Most wallwarts are AC- to DC unregulated- the stated output is at the stated current draw. The innards are a transformer, rectifier(AC-DC), and a capacitor that makes the DC into "pure" DC. If a wall wart says "switching adapter" it has electronics that convert the AC to DC. Advantage is that the output will always be the stated output volts--even at zero load. The conventional unit's output volts will be higher at zero load. Hope this simple explanation helps---
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