How voltage amplification affects plasma flux density?

[CognitiveNet]

Would a voltage amplification with the same power output increase plasma density and increase the magnetic field of the plasma, if the power output does not change?

In the case of a USB plasma globe with a current flow of 300mA through 5 volt, amounts to 1,5W.
CASE A:

Ofcourse this voltage has to be amplified in a transformer to at least 1000 volt, in that case the current would be nominal 1,5mA.

CASE B:
Now what if we amplified the voltage up to 10'000 volt, the current would be 1,5 micro ampere.
How would this affect the plasma?
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Question 2:
What is the ideal voltage to current ratio for any given power?

 

[MikeBH]

The plasma density for a fixed gap will generally depend on the current, so increasing the volatge and keeping the power constant will produce a lower plasma density.