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Iron-hydrogen resistor

 

 
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An iron-hydrogen resistor is a PTC
Positive temperature coefficient

Positive Temperature Coefficient refers to materials that experience an increase in electrical resistance when their temperature is raised. Materials which have useful engineering applications usually show a relatively rapid increase with temperature, i.e....
 and consists of a hydrogen
Hydrogen

Hydrogen is the chemical element with atomic number 1. It is represented by the chemical symbol H. At standard temperature and pressure, hydrogen is a colorless, odorless, nonmetallic, tasteless, highly combustion and explosive Diatomic molecule gas with the molecular formula H2....
-filled glass bulb like a light bulb, in which an iron
Iron

Iron is a chemical element with the symbol Fe and atomic number 26. Iron is a Group 8 element and period 4 element. Iron is lustrous and silvery in color....
 wire is located. The technology was in use until the 1950s for the automatic adjustment to different main voltages. The modern successor to this device is the current source
Current source

A current source is an electrical or electronic device that delivers or absorbs electric current. A current source is the Duality of a voltage source....
.

Iron-hydrogen resistor
Resistor

|- align = "center"||width = "25"|| |- align = "center"||| Potentiometer|- align = "center"| || |- align = "top"| Resistor|| Variable resistor...
s are PTC and constant current
Constant current

Constant current is a term most often used in electronics to describe a system that can vary the voltage across an electronic circuit to maintain a constant electric current....
 sources. When the voltage rises the temperature will increase, the higher temperature leads to a higher electrical resistance
Electrical resistance

The electrical resistance of an object is a measure of its opposition to the passage of a steady electrical current. An object of uniform cross section will have a resistance proportional to its length and inversely proportional to its cross-sectional area, and proportional to the resistivity of the material....
 reducing the effect on the electricity flow.






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Encyclopedia


An iron-hydrogen resistor is a PTC
Positive temperature coefficient

Positive Temperature Coefficient refers to materials that experience an increase in electrical resistance when their temperature is raised. Materials which have useful engineering applications usually show a relatively rapid increase with temperature, i.e....
 and consists of a hydrogen
Hydrogen

Hydrogen is the chemical element with atomic number 1. It is represented by the chemical symbol H. At standard temperature and pressure, hydrogen is a colorless, odorless, nonmetallic, tasteless, highly combustion and explosive Diatomic molecule gas with the molecular formula H2....
-filled glass bulb like a light bulb, in which an iron
Iron

Iron is a chemical element with the symbol Fe and atomic number 26. Iron is a Group 8 element and period 4 element. Iron is lustrous and silvery in color....
 wire is located. The technology was in use until the 1950s for the automatic adjustment to different main voltages. The modern successor to this device is the current source
Current source

A current source is an electrical or electronic device that delivers or absorbs electric current. A current source is the Duality of a voltage source....
.

Iron-hydrogen resistor
Resistor

|- align = "center"||width = "25"|| |- align = "center"||| Potentiometer|- align = "center"| || |- align = "top"| Resistor|| Variable resistor...
s are PTC and constant current
Constant current

Constant current is a term most often used in electronics to describe a system that can vary the voltage across an electronic circuit to maintain a constant electric current....
 sources. When the voltage rises the temperature will increase, the higher temperature leads to a higher electrical resistance
Electrical resistance

The electrical resistance of an object is a measure of its opposition to the passage of a steady electrical current. An object of uniform cross section will have a resistance proportional to its length and inversely proportional to its cross-sectional area, and proportional to the resistivity of the material....
 reducing the effect on the electricity flow. The hydrogen filling protects the iron not only against oxidation, but enhances the effect since the solubility of hydrogen in iron will increase when the temperature increases resulting in the higher resistance.

Iron-hydrogen resistors were used in the early days of broadcasting
Broadcasting

Broadcasting is distribution of Sound and/or video Signalling s which transmit programs to an audience. The audience may be the general public or a relatively large sub-audience, such as children or young adults....
 technology and placed in series with the filaments of electron tubes to stabilize the flow of electricity in heating circuits with fluctuating voltage.

See also

Hot wire barretter
Hot wire barretter

The hot wire barretter was a demodulator detector invented in 1902 by Reginald Fessenden that found limited use in early radio receivers. In effect it was a highly sensitive thermoresistor developed to permit the reception of amplitude modulated signals, something that the coherer could not do....


External links

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