The 7cm Plasma Ball gives you a lightning show in your own room. The glass bulb is filled with negative ionised gas through which the current appears to travel like lightning. When you touch the lightning globe, the electricity is attracted to your finger in a single thick strand as it tries to get to the ground. The lightning ball has 2 different modes - normal (as described above) or sounds activated!
Plasma Balls are great geeky gifts and an awesome desktop gadget. Perhaps give this gizmo as a thank you present to your science teacher or use it to light up your bedroom. It's positively electrifying!
How Does the Plasma Ball Work?
Plasma Balls are filled with and inert gas that doesn't chemically react. Inside the dome is an electrode, an electrical conductor connecting a metallic conductor with a non-metallic conductor (the outer glass ball).
When the plasma ball is turned on the electrode transmits a voltage that causes an electric field inside the ball. The electric field allows the electrons to travel to the electrode because they are attracted to its negative charge.
At the same time a second voltage is created which changes the electric field and causes the electrons path to change, making wavey lines. This field means that electrons can travel from the negatively charged electrode, trying to make a neutral charge elsewhere, which just happens to be at the glass ball.
The change is actually invisible however the gas ionizes the electrodes as they pass through the gas. These multiple charges mean that the atoms must lose energy and in order to do this they emit a photon which we see as light. The colour it is depends on the gas inside.
NOTE: This item is not a toy and should not be placed near sensitive electronic equipment, and is not recommended for people with a pacemaker. Colours may vary.