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The Tesla coil uses high-frequency transformer action together with resonant voltage amplification to generate potentials in the range of tens to hundreds, or even thousands of kilovolts. We describe a range of experiments designed to investigate the Tesla coil action, ending up with the design and development of a touring Tesla coil with a carefully considered trade-off between portability and performance. The apparatus plugs into a standard 230 V wall socket, drawing an average of 7 A, anddoi:10.1088/0143-0807/21/2/302 fatcat:wes2jxa6xjdobl4c6xbztiutbe