Just a simple calculation of what sort of energy is in a resonant coil:
Here are the basic parameters:
R = 0.424 ohms (Wire)
L = 0.0934 henry (Coil)
C = 1466 pF (Capacitor)
V = 58 volts RMS
The resonant frequency
F = 1/(2xpixsqr(LxC)) = 43 Khz
The maximum amperage peak
I = Vs/R = 136.66 amps max
The root mean squared amperage
Irms = I / sqrt(2) = 96.638 amps RMS
The VA generator apparent power input required
VA = V x Irms = 5605 watts VA Rms
The inductive reactance
XL= 2xpixLxF = 2524.53 ohms
The capacitive reactance
XC= 1/(2xpixCxF) = 2524.53 ohms
The Quality of the Coil
Q = XL / R = 5948.65
The Voltage magnification of the coil
VL= XLxI = Q x V = 345022 volts RMS
The potential rise inside the Capacitor
VC= XCxI = 345022 volts RMS
Energy circulating in the Coil and the Capacitor
WL=1/2 x L x Irms^2 = 174.5 joules max
WC=1/2 x C x VC^2 = 174.5 joules max
The Resonant Condition
XL = XC
VL = VC
WL = WC
As you can see all the energy is continuously oscillating between the coil and the capacitor, or between the magnetic component of electricity and the electrostatic component of electricity. This energy can be expressed as watts and horse power as Tesla has done in his many articles, thus describing the massive movement of energy per second, allowing the reader to sense that it is a very powerful oscillator.
time = 1/frequency = 0.000023254 seconds
Watts = joules / time
Watts = 174.5 / 0.000023254
Watts = 7504699 watts
Horse Power = 7504699 / 745.697 = 10064 HP