Jump to content
  • entries
    8
  • comments
    6
  • views
    1,732

Jacob's Ladders Are Cool


Qwayway

737 views

Electricity is cool. Electricity travelling through air is cooler. Well, it looks cooler at least. It's actually really hot.

Jacob's Ladders are neat little devices that send a roughly-horizontal electrical arc travelling upward between two electrodes.

Jacobs_Ladder_HM.thumb.jpg.674492048434253c7289039ee53c0f81.jpg

Source: https://en.wikipedia.org/wiki/Spark_gap#Visual_entertainment

This is a long exposure picture of a Jacob's Ladder - there's actually only one arc at any given time.

The mechanism behind the ladder effect is actually pretty simple. When the arc initially forms, it heats the air up quite a bit, as is evident from the glow it produces. This hot air has more energy, so it expands, which decreases its density relative to the air around it. Since it's less dense, it experiences a buoyant force upward, and since the electrons can more freely travel through already-ionized air, the arc follows the hot air upwards. Once the arc reaches a length at which it can't keep the air hot enough to remain ionized, the arc breaks apart and the path of least resistance returns to being the very base of the ladder, so the process repeats.

0 Comments


Recommended Comments

There are no comments to display.

Guest
Add a comment...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...