Why does the iPad make the same noise when it connects to a charger that doesn't charge it as one that will charge it???

Why does the iPad make the same noise when it connects to a charger that doesn't charge it as one that will charge it???
I would expect that it would make an unusual noise if plugged into a generic USB charger that does not have enough oomph to charge a pad to alert you - otherwise, you might think the noise is reassuring that you are actually charging it.

I guess my question was actually more of a comment on the (lack of) design!  It is unusual that something like this would still be in an Apple product.  There are wall chargers that have a USB port on them that do not have the required oomph to charge the iPad.  I have one that has two USB ports, one for my iPhone  (it won't charge an iPad), and one for an iPad with greater amperage rating.  I accidentally used the wrong ones for a while yesterday, but noticed before being "surprised" the next morning by an uncharged iPad.  The iPad is smart enough to say "Not charging" by the battery icon when it is plugges in to one of these, so it "knows" - seems like it would be fairly simply to have the iPad make a different or additional noise  wehn it puts up the "Not charging" text icon.  Failsafe user experience?

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