There has been this box in one of my outlets that has been here since I moved in and just now took it off and it says it’s a Class 2 Power Supply. Not an electrician, but why is it there?
In: Technology
It could just be a transformer, which turns household AC into some (probably) lower voltage. Or it could be a transformer plus a rectifier and some smoothing circuitry, for turning AC into DC.
If you look on the box, it might have some text about its input and output. They often say “input 120VAC output 5VDC”, something to that effect.
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