Science Gizmos – Energy Ball
This science gizmo Energy Ball now has upgraded electronics, and a pull tab to preserve battery life. It is a great way to demonstrate for kids how to conduct electricity in a circuit.
The ball contains 2 small metal electrodes that, when touched simultaneously, cause it to light up. Comes with a Teacher’s Guide. No other energy ball on the market with these upgraded features.
(NOTE: Brand may vary from image displayed)
[Wikipedia excerpt: ‘…Resistance touch switch: A resistance switch needs two electrodes to be physically in contact with something electrically conductive (for example a finger) to operate. They work by lowering the resistance between two pieces of metal. It is thus much simpler in construction compared to the capacitance switch. Placing one or two fingers across the plates achieves a turn on or closed state. Removing the finger(s) from the metal pieces turns the device off. One implementation of a resistance touch switch would be two Darlington-paired transistors where the base of the first transistor is connected to one of the electrodes. Also, an N-Channel, enhancement-mode, metal oxide field effect transistor can be used. Its gate can be connected to one of the electrodes and the other electrode through a resistance to a positive voltage…..’ ].