Control lightning with this desktop plasma ball. A small Tesla coil generates a large electrical potential difference, which tries to even itself out by dischargingin the same way that a cloud discharges lightning. Watch the plasma streams move toward your uncharged finger as you touch the ball, or make them respond to sound and music.
For ages 12 and up. 7" diameter x 11 1/2"H.
Electrical engineer Nikola Tesla invented the plasma globe when he was studying high-voltage phenomena in the late 19th century. The device is simple: a glass globe with an electrode inside. The ball is filled with inert gasesoften neon and argonat slightly below atmospheric pressure.
When you apply voltage to the electrode by turning the plasma globe on, it creates an alternating current that creates an electromagnetic field inside the ball. The first current sets the electrons in motion; the second current changes their path, which results in the colorful ribbons of light that dance up the sides of the globe.
The color (usually pinkish-purple) is a result of the gases. The high voltage that’s created inside the globe causes electrons to break free of the electrode in the center. As these electrodes break away, they accelerate, gaining energy and giving an electrical charge to the gasionizing it. As the electrons continue to pass through the gas, the excited gas particles have to find a way to give off some of the energy they’re gaining. They do this in the form of photons, or light. Different gases give off different colored light. Neon is red with pinkish-orange “fingers” at the ends, and argon is purple.
When you place your finger on the globe, it acts as a conductor of electricity, changing the electromagnetic field and attracting the plasma. Just don’t leave your finger in one spot for too long. All that electric charge builds up and can begin to warm the glass.
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We’re proud to have been supporters of STEM learning since long before the acronym was invented. Anyone who has watched a child open a present only to set the gift aside and play with the box knows that kids have an innate curiosity and desire to explore and understand their world. National Geographic explorers never lose that curiosity, and it has lead to some of the most remarkable discoveries in the last 125 years.
Periodically I place the end of my right thumb which was surgically amputated due to cancer in contact with the globe, which causes the internal lightning to focus or concentrate from electrode in the center of the globe to the end of my thumb. I imagine that some magical healing power occurs when the lightning concentrates on my thumb stub. Since this item really doesn't do anything other than emit lightning within the globe, the owner can imagine anything he or she chooses to. So- this is what I do- and enjoy the visual effects of the the plasma globe. It will do anything that you pretend to imagine, and it does it beautifully. Have fun. *****
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