Question- would a tesla coil function in space?
What I think would happen- Tesla coils are basically a high DC voltage arcing through the air, searching for the easiest path to ground. A single coil will just send out sparks that dissipate(depends on the power level) a few inches away from the coil. If there are 2 that are linked, the electricity flows through one to the other.
BUT, in both of these cases, there was one thing present in both of them- atmosphere, which is where I'm concerned. I've heard that tesla coils are used to test for a vacuum, and if nothing happens, then you have a vacuum.
I don't think tesla coils would work in space, but I might be wrong, so somebody either correct or confirm this.
BONUS- If you can, also try and figure out a way maybe they could work as spacecraft weaponry.