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This equivalent circuit of part of a Tesla coil has stray capacitance between each winding and one to ground. Parasitic capacitance or stray capacitance is the unavoidable and usually unwanted capacitance that exists between the parts of an electronic component or circuit simply because of their proximity to each other.
The wide gap of several centimeters between the coils also ensures that there is minimal interwinding capacitance, to prevent RF voltage being induced in the supply wiring by capacitive coupling. A spark gap is often located nearby with a gap smaller than the gap between the rings, to prevent damage to the transformer and transmitting equipment ...
An RLC circuit (or LCR circuit) is an electrical circuit consisting of a resistor, an inductor, and a capacitor, connected in series or in parallel.The RLC part of the name is due to those letters being the usual electrical symbols for resistance, inductance and capacitance respectively.
When only interwinding capacitance and a tiny secondary load is present to absorb the energy, very high-frequency oscillations occur, and these "parasitic oscillations" represent a possible source of electromagnetic interference. The potential of the secondary voltage now flips to negative in the following manner.
C2 is not an actual capacitor but represents the capacitance of the secondary windings L2, plus the capacitance to ground of the toroid electrode E. A Tesla coil is a radio frequency oscillator that drives an air-core double-tuned resonant transformer to produce high voltages at low currents.
In electrical engineering, coil winding is the manufacture of electromagnetic coils. Coils are used as components of circuits, and to provide the magnetic field of motors, transformers, and generators, and in the manufacture of loudspeakers and microphones. The shape and dimensions of a winding are designed to fulfill the particular purpose.