Menu
Home
People
Places
Arts
History
Plants & Animals
Science
Life & Culture
Technology
Reference.org
Iron–hydrogen resistor
open-in-new
<p>An iron–hydrogen resistor consists of a <a href="/facts/Hydrogen/BoYHjl0J">hydrogen</a>-filled glass bulb (similar to a light bulb), in which an <a href="/facts/Iron/QK1JYy8E">iron</a> wire is located. This resistor has a <a href="/facts/Positive_temperature_coefficient/Ayc1aNdm">positive temperature coefficient</a> of resistance. This characteristic made it useful for stabilizing circuits against fluctuations in power-supply voltages. This device is often called a "barretter" because of its similarity to the <a href="/facts/Hot-wire_barretter/WubHlsnV">barretter</a> used for detection of radio signals. A modern successor to the iron–hydrogen resistor is the semiconductor <a href="/facts/PTC_thermistor/8c4xrRgq">PTC thermistor</a>. </p>