If you have been to any high-school science fair, it is almost impossible that you have not seen 1.
What is 1 popularly known as?

1.

Hint: A time exposure shot of the above thing in action looks like this

2.

Answered by: Srikanth ( back in full form ;) ) and yaksha

1 is called the Jacob’s ladder.

If you see the time exposure shot in 2, you can easily guess why it is called so. If you have not seen a Jacob’s Ladder and wish to see one and want to win bonus points offered by srikanth, head right away(with a camera) to Visvesvaraya Industrial and Technological Museum (VITM) in Bangalore(One of the most incredible technological museums on this planet :) )