Like... hm. This. [The image that pops up on the screen is probably very similar to the lanterns Rapunzel is used to, though it's also not just a normal fire flame by the colour of it.] Different gases are used for light and heat to make it float.

And ah... it is like lightning yes. Though far more controlled and much less violatile, as a bolt of lightning carries more energy in it than the... er, power used by machinery and equipment using electricty.