Search results
Results from the WOW.Com Content Network
A spark plug.The spark gap is at the bottom. A spark plug uses a spark gap to initiate combustion.The heat of the ionization trail, but more importantly, UV radiation and hot free electrons (both cause the formation of reactive free radicals) [citation needed] ignite a fuel-air mixture inside an internal combustion engine, or a burner in a furnace, oven, or stove.
A spark-gap transmitter is an obsolete type of radio transmitter which generates radio waves by means of an electric spark ... vacuum tube transmitters were developed
As the gap was reduced further, the voltage required to cause an arc began to rise and again exceeded its original value. For a given gas, the voltage is a function only of the product of the pressure and gap length. [2] [3] The curve he found of voltage versus the pressure-gap length product (right) is called Paschen's curve. He found an ...
When the pulsed current is applied to the electrodes under ultra-high vacuum, a spark discharge plasma occurs in the spark gap in which ions are generated via electron impact. Within the discharge plasma, the sample evaporates, atomizes, and ionizes via electron impact. [7]
Krytrons tend to be used for triggering a secondary switch, e.g., a triggered spark gap, while sprytrons are usually connected directly to the load. The trigger pulse has to be much more intense, as there is no preionized gas path for the electric current, and a vacuum arc must form between the cathode and anode. An arc first forms between the ...
For example, a spark gap can be fitted with arcing horns − two wires, approximately vertical but gradually diverging from each other towards the top in a narrow V shape. Once ignited, the arc will move upwards along the wires and will break down when the distance between the wires will become too large.
High-current switching tubes, e.g. triggered spark gap, ignitron, thyratron and krytron (and its vacuum tube derivate, sprytron, using vacuum arc), high-power mercury-arc valves and high-power light sources, e.g. mercury-vapor lamps and metal halide lamps, operate in this range.
The Alexanderson alternator followed Fessenden's rotary spark-gap transmitter as the second radio transmitter to be modulated to carry the human voice. Until the invention of vacuum-tube (valve) oscillators in 1913 such as the Armstrong oscillator , the Alexanderson alternator was an important high-power radio transmitter , and allowed ...