Levitating light bulb needs no wires
We are no strangers to things that levitate and fly, but a light bulb? Believe it or not, this levitating light bulb can power itself wirelessly. An electrical engineering student from the University of Queensland developed this prototype of a levitating light bulb.
It took Chris Rieger 6 months to come up with it, combining previous researches conducted by other individuals. It is a combination of a magnetic wireless power transfer system and a magnetic levitating control system. The hardest part of the project was the wireless power transfer functionality.
How did he do it? He built an oscillator and a wireless power receiver circuit, which is a simple LC circuit tuned at exactly 1Mhz. Wireless power transfer is via a single large hoop of wire driven by alternating current at 1 MHz. That part of the system pulls 0.5A at 12V, which makes the total consumption about 9 Watts.
A permanent magnet on the light assembly is used to levitate the bulb. This is quite an accomplishment. Make sure you check out the video.