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Spark gap - Wikipedia. A spark gap consists of an arrangement of two conductingelectrodes separated by a gap usually filled with a gas such as air, designed to allow an electric spark to pass between the conductors. When the potential difference between the conductors exceeds the breakdown voltage of the gas within the gap, a spark forms, ionizing the gas and drastically reducing its electrical resistance. An electric current then flows until the path of ionized gas is broken or the current reduces below a minimum value called the "holding current". This usually happens when the voltage drops, but in some cases occurs when the heated gas rises, stretching out and then breaking the filament of ionized gas.

Usually, the action of ionizing the gas is violent and disruptive, often leading to sound (ranging from a snap for a spark plug to thunder for a lightning discharge), light and heat. Spark gaps were used historically in early electrical equipment, such as spark gap radio transmitters, electrostatic machines, and X- ray machines. Their most widespread use today is in spark plugs to ignite the fuel in internal combustion engines, but they are also used in lightning arresters and other devices to protect electrical equipment from high- voltage transients. Spark visibility[edit]The light emitted by a spark does not come from the current of electrons itself, but from the material medium fluorescing in response to collisions from the electrons. When electrons collide with molecules of air in the gap, they excite their orbital electrons to higher energy levels.

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.

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When these excited electrons fall back to their original energy levels, they emit energy as light. It is impossible for a visible spark to form in a vacuum. Without intervening matter capable of electromagnetic transitions, the spark will be invisible (see vacuum arc). Applications[edit]Spark gaps are essential to the functioning of a number of electronic devices. Ignition devices[edit]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) ignite a fuel- air mixture inside an internal combustion engine, or a burner in a furnace, oven, or stove.

The more UV radiation is produced and successfully spread into the combustion chamber, the further the combustion process proceeds. Protective devices[edit]. Tim And Eric`S Billion Dollar Movie Full Movie there.

The switch contacts on a multimeter acting as a PCB spark gap. Spark gaps are frequently used to prevent voltage surges from damaging equipment. Spark gaps are used in high- voltage switches, large power transformers, in power plants and electrical substations.

Such switches are constructed with a large, remote- operated switching blade with a hinge as one contact and two leaf springs holding the other end as second contact. If the blade is opened, a spark may keep the connection between blade and spring conducting. The spark ionizes the air, which becomes conductive, allowing an arc to form, which sustains ionization and hence conduction.) Here, a Jacob's ladder on top of the switch will pull the arc apart and so extinguish it. One might also find small Jacob's ladders mounted on top of ceramic insulators of high- voltage pylons. These are sometimes called horn gaps. If a spark should ever manage to jump over the insulator and give rise to an arc, it will be extinguished. Watch What Do You Say To A Naked Lady? Putlocker.

Smaller spark gaps are often used to protect sensitive electrical or electronic equipment from high- voltage surges. In sophisticated versions of these devices (called gas tube arresters), a small spark gap breaks down during an abnormal voltage surge, safely shunting the surge to ground and thereby protecting the equipment.

These devices are commonly used for telephone lines as they enter a building; the spark gaps help protect the building and internal telephone circuits from the effects of lightning strikes. Less sophisticated (and much less expensive) spark gaps are made using modified ceramic capacitors; in these devices, the spark gap is simply an air gap sawn between the two lead wires that connect the capacitor to the circuit. A voltage surge causes a spark that jumps from lead wire to lead wire across the gap left by the sawing process. These low- cost devices are often used to prevent damaging arcs between the elements of the electron gun(s) within a cathode ray tube (CRT).[citation needed]Small spark gaps are very common in telephone switchboards, as the long phone cables are very susceptible to induced surges from lightning strikes. Larger spark gaps are used to protect power lines.

Spark gaps are commonly implemented on Printed Circuit Boards in mains power electronics products using two closely spaced exposed PCB traces. This is an effectively zero cost method of adding crude overload protection to electronics products.[1]Transils and trisils are the solid- state alternatives to spark gaps for lower- power applications. Neon bulbs are also used for this purpose. High speed photography[edit]. A photo of a Smith & Wesson firing, taken with an air- gap flash.

The photo was taken in a darkened room with the camera's shutter open, and the flash was triggered by the sound of the shot using a microphone. A triggered spark gap in an air- gap flash is used to produce photographic light flashes in the sub- microsecond domain. Radio transmitters[edit]A spark radiates energy throughout the electromagnetic spectrum.

Nowadays, this is usually regarded as illegal radio frequency interference and is suppressed, but in the early days of radio communications (1. Many radio spark gaps include cooling devices, such as the rotary gap and heat sinks, since the spark gap becomes quite hot under continuous use at high power. Sphere gap for voltage measurement[edit]A calibrated spherical spark gap will break down at a highly repeatable voltage, when corrected for air pressure, humidity and temperature. A gap between two spheres can provide a voltage measurement without any electronics or voltage dividers, to an accuracy of about 3%. A spark gap can be used to measure high voltage AC, DC, or pulses, but for very short pulses, an ultraviolet light source or radioactive source may be put on one of the terminals to provide a source of electrons.[2]Power- switching devices[edit]Special purpose, high- energy triggerable spark gaps can be used to rapidly switch high voltages and very high currents for certain pulsed power applications, such as pulsed lasers, railguns, fusion, ultrastrong pulsed magnetic field research, and in the triggering of nuclear bombs.

Commercially available devices can be divided into two classes: positive pressure and triggered vacuum gaps. Positive pressure triggered gaps have a limited operating voltage range (for instance, from 1/3 to 2/3 of the self breakdown voltage). Triggered vacuum gaps offer a wide operating voltage range (4.

V to 9. 0 k. V is achievable). Both classes can switch higher energy levels than any thyristor, thyratron, krytron, or sprytron. Triggered gaps are popular for single- shot and low- repetition- rate applications.

One such switch is known as a trigatron. The Ignitron and Crossatron could be considered triggered gaps. Watch Clownhouse Streaming more.

The latter is unique in that it can be turned back off by the control electrode after conduction begins. The xenon flash tube is another common triggered gap. Various schemes have also been devised to trigger open air gaps on command. A set of spark gaps are a key element of a Marx generator, used to generate high- voltage impulses; the spark gaps allow a chain of capacitors to be slowly charged in parallel and then rapidly discharged in series. Visual entertainment[edit]. A time exposure of a Jacob's ladder. A Jacob's ladder (more formally, a high voltage traveling arc) is a device for producing a continuous train of large sparks that rise upwards.

The spark gap is formed by two wires, approximately vertical but gradually diverging from each other towards the top in a narrow V shape.