Plasma Ball

[dom78]

How does a plasma ball work?

[bobbobley]

when you switch it on light shines towards the glass and when you put your hands on and move them around it follows your movements. they're great!

[lisaj]

The central pole is negatively charged with electrons . The inside surface of the glass bowl is coated with graphite and earthed. The high voltage, or potential difference, makes the electrons arc to the earthed graphite. Your hand attracts the electrons because you too are earthed, but to a lesser degree - hence you don't get electrocuted since most of the current flows through the graphite.

[poadster]

First you need to hire a big hall, then arrange catering, then get a big band, then invite all the plasmas you can contact.