3 ms·

AC adapters are rarely 3-prong? If they were, though, I'd expect the to stay in better, even upside down.

• btgeekboy 7y ago
  They’re not 3-prong, but many are polarized.
  • yardie 7y ago
    I've rarely seen a DC transformer that is also polarized. It's literally a coil of wire passing from hot to neutral. Which way doesn't matter as it's rectified from AC pos/neg to DC +wire -wire.