Sorry but this item is currently unavailable.
Please check back at a later stage.
Our Classic Induction Coil demonstrates the principles of electrostatic induction. As with all induction coils of "Ruhmkorff" style, ours is a step-up transformer that takes in 6-12 volts but puts out 25,000-50,000 volts at a fraction if the input amperage.
An indiction coil's output voltage is proportional to the input voltage. In short, an input voltage of 6 volts @ 2.5 amps will produce an output voltage of 25,000 volts. If the input is doubled to 12 volts @ 5 amps, the coil will produce 50,000 volts of output.
As a classic step up transformer, our Classic Induction Coil consists of 3 main parts: the primary coil connected to the power source, the iron core which the primary coil is wrapped around and the secondary which is wound over the primary coil and core. The secondary coil contains 10-1000x as many windings as the primary coil.
As the primary coil is energized from the power source, a magnetic field is produced. Once this field is switched off, the magnetic flux induces a current in the secondary coil resulting in a higher voltage but lower amperage...hence the name induction coil. This process can be thought of as using gears on a bicycle, as the rear gear always spins faster than the one connected to the pedal. Power is always proportional to the gear or "winding" ratio. When a higher speed or voltage is required, there is always proportionally less power or in the case of transformers amperage.
The interrupter mechanism is vital to the operation of this coil. It consists of a capacitor and magnetic switch which is opened to the off position as a primary is energized, allowing for magnetic flux to energize the coil tens of times per second.
Developed from Michael Faraday's principal of electromagnetic induction in the mid 1800's, the spark coil was finally comericalized in the 1850's by Heinrich Rhumkorff. The Classic Spark Coil is known by many names; the Induction Coil, The Spark Coil and most approptiately, the Rhumkorff Coil.
The spark coil eventually replaced the Wimshurst and outher influence machines due to it's power and compact size. Mr. Rhumkorff's coil found many uses which incuded powering early X-ray tubes, Morse Code radio transmitters, high voltage research and engine ignition systems. Although most of these applications have advanced very far in the last 100+ years, variations of the spark coil still are used in the most advanced car engines.