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Difference in single and dual iPhone wall charger

Hi Experts!


Question, what's the difference in efficiency with a single and dual USB charger? Below I place both image, the single connection is 5V/1A and the dual connector is 5V/2A.

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There's really nothing more to it.  ??
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What does that mean?
Since they both have switching power supplies in them to generate the output, there would normally be very little difference in efficiency.  The 2 amp charger will only generate 2 amps if the load, the devices to be charged, require it.
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So the dual wall charger (right image) would charge 2 iPhone the same as the single wall charger (left image white)?
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Please excuse my ignorance and little electrical knowledge, but if u can, a dual AC charger (5V) would charge 2 iPhones slower than single (5V) charger? I mean, if I charge 2 iPhone simultaneously in the dual charger and 1 iPhone in the single charger, would all 3 iPhone charge the same in length of time?  I asked because both charger is 5V and I my hardly-none-electronic know-how tells me that the dual charge of 5V would give 2.5V to each iPhone charging?


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Thank uuuuuu!
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Great info!
You're welcome!