Tell us about yourself!
did you found which diode to use?)))
read how semiconductors acts
Schottky or rectification diode for ex 1N4007
no solar panel itself is not consumer (if you put diode voltage will fall to 4.8-4.92)
its not a plasma (just aluminum heated by high currency flow through thin conductor)
DO YOU WANT TO SEE REAL PLASMA click https://www.youtube.com/watch?v=X7WJHn56l3k
no drill will spin can faster (higher force momentum)