In message 
          Michael J. Mahon  wrote:

>Markus Robert Kessler  wrote:
>>
>> The funny thing is, meanwhile I found a power supply which was part of a
>> "Raspberry 2 starter kit" from Vilros. This one delivers 5V and 2A also,
>> but in reality, there are 5.37 Volts without load, measured with the
>> device above.
>> Surprisingly RPi did not complain about "over voltage".
>
>Logic "5V" means anything between 4.5v and 5.5v.

That's not normally true - lots of (most?) 5V stuff requires at least
4.75V these days.  There is no generally applicable upper limit - it
could be as close as 5.25V, or could be higher, possibly substantially
so.  The higher values are expected if the "5V" goes into a regulator
and nothing else.  In such a case the upper limit depends on the
performance or heat dissipation of the regulator.

But I repeat, what matters is what voltage arrives at the destination
end of the cable, which is often substantially and surprisingly less
than what was launched into it.  It's no use pontificating about what
it must be, bearing in mind the current consumption and the cable's
resistance.  Just measure it at the consuming device.  Only then will
you know.

And if there's an undervoltage symbol on the screen, the consuming
device is already saying there's a problem.

Dave

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