It's clear now, thanks.

At 17:17 2016-08-09, Bob Ammerman wrote:
>As you increase the current, the voltage drop goes down.
>
>~ Bob Ammerman
>RAm Systems
>
>> -----Original Message-----
>> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
>> Of Electron
>> Sent: Tuesday, August 09, 2016 10:39 AM
>> To: Microcontroller discussion list - Public. <piclist@mit.edu>;
>piclist@mit.edu
>> Subject: RE: [EE] High current and voltage diode, but not fast recovery
>>=20
>>=20
>> >> On a side note, what is the impedance I can expect from an arc? So to
>> >> calculate the voltage required to make x Ampere flow through it.
>> >
>> >An arc is a negative resistance.
>>=20
>> Negative resistance? I do not understand what this means.
>>=20
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