Tesla coils are one of those builds that capture ... However, this is quite a small unit; with larger ones, the power is much higher, and the resulting discharge sparks much longer.

Such a setup within reason allows the circuit to oscillate with a wide range of Tesla coil designs, and track any small changes, minimizing the need for fiddly manual tuning that is the usual path ...

particularly the Tesla Coil (originally called Tesla Oscillator) – a high frequency oscillator that enabled the inventor to conduct a series of revolutionary experiments including wireless ...

Although the Tesla unit is extensively used, and the Tesla coil which is one of his most ingenious inventions, it's also extensively used. We have wireless transmission of energy all the time.