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Thread: Superconductivity by Joe Khachan and Stephen Bosi

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Bridge circuits

Bridge circuits are used very commonly as a variable conversion element in measurement systems and produce an output in the form of a voltage level that changes as the measured physical quantity changes. They provide an accurate method of measuring resistance, inductance and capacitance values, and enable the detection of very small changes in these quantities about a nominal value. Read this topic
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    Download Superconductivity by Joe Khachan and Stephen Bosi

    The discovery of superconductors


    The phenomenon of superconductivity, in which the electrical resistance of certain materials completely
    vanishes at low temperatures, is one of the most interesting and sophisticated in condensed matter
    physics. It was first discovered by the Dutch physicist Heike Kamerlingh Onnes, who was the first to
    liquefy helium (which boils at 4.2 Kelvin at standard pressure). In 1911 Kamerlingh Onnes and one of his
    assistants discovered the phenomenon of superconductivity while studying the resistance of metals at low
    temperatures. They studied mercury because very pure samples could easily be prepared by distillation.

    The historic measurement of superconductivity in mercury is shown in Figure 1. As in many other metals,
    the electrical resistance of mercury decreased steadily upon cooling, but dropped suddenly at 4.2 K, and
    became undetectably small. Soon after this discovery, many other elemental metals were found to exhibit
    zero resistance when their temperatures were lowered below a certain characteristic temperature of the
    material, called the critical temperature


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    Re: Superconductivity by Joe Khachan and Stephen Bosi

    Thank you for sharing the info on superconductivity, Can you please try to post some more information.

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