Tesla Coil Schematics

    The tesla coil was patented in 1891 and allowed him to send energy through vacuum tubes by wireless transmission.  The ability to have wireless energy greatly aided in the work of electric-magnetic fields while also paving the path for wireless communication (radio), x-ray, and improvements in AC generators.
    A tesla coil is a high frequency alternating-current transformer that amplifies the current and voltage.  The Tesla High Frequency Coil consists of four main parts: The step-up transformer (high voltage transformer/induction transformer), the interrupter (spark gap), the condenser (high voltage capacitor), and the oscillation transformer (combination of primary coil and capacitor) [Haller & Cunningham].  The step-up transformer is an induction coil that is connected to the source of power (the AC mains) and it is used to charge the condenser until it is fully charged.  The condenser gathers

the electricity until it has reached its highest charge capacity.  At this point, the interrupter, which has been acting to provide a path of high resistance until the condenser is at its full capacity (not allowing electricity to flow), instead collapse and connects the primary circuit.  This discharges the condenser and returns the interrupter back to a path of high resistance.  The electricity in the primary circuit during the collapse of the interrupter creates an electric-magnetic field, the energy stored within the secondary coil used as an inductor.  The action of the interrupter collapsing and returning back to high resistance has a certain period, resulting in a certain frequency of electricity.  Since alternating-current mains constantly apply electricity to the condenser, the condenser acts on the system similarly as a driven oscillation where a resonance can be reached.  At this resonance, the voltage and current are greatly amplified.

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