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  2. Resistance thermometer - Wikipedia

    en.wikipedia.org/wiki/Resistance_thermometer

    Many RTD elements consist of a length of fine wire wrapped around a heat-resistant ceramic or glass core but other constructions are also used. The RTD wire is a pure material, typically platinum (Pt), nickel (Ni), or copper (Cu). The material has an accurate resistance/temperature relationship which is used to provide an indication of temperature.

  3. Resonant-tunneling diode - Wikipedia

    en.wikipedia.org/wiki/Resonant-tunneling_diode

    An RTD can be fabricated using many different types of materials (such as III–V, type IV, II–VI semiconductor) and different types of resonant tunneling structures, such as the heavily doped p–n junction in Esaki diodes, double barrier, triple barrier, quantum well, or quantum wire.

  4. Earth-return telegraph - Wikipedia

    en.wikipedia.org/wiki/Earth-return_telegraph

    This usually means two distinct metal wires in the circuit, but in the earth-return circuit one of these is replaced by connections to earth (also called ground) to complete the circuit. Connection to earth is made by means of metal plates with a large surface area buried deeply in the ground. These plates could be made of copper or galvanised ...

  5. RTD - Wikipedia

    en.wikipedia.org/wiki/RTD

    RTD may refer to: Science and technology. Real-time data; Residence time distribution; Resonant-tunneling diode; Round-trip delay time, in telecommunications;

  6. Four-terminal sensing - Wikipedia

    en.wikipedia.org/wiki/Four-terminal_sensing

    Four-point measurement of resistance between voltage sense connections 2 and 3. Current is supplied via force connections 1 and 4. In electrical engineering, four-terminal sensing (4T sensing), 4-wire sensing, or 4-point probes method is an electrical impedance measuring technique that uses separate pairs of current-carrying and voltage-sensing electrodes to make more accurate measurements ...

  7. Insurer stocks fall after Trump says 'we're going to knock ...

    www.aol.com/news/insurer-stocks-fall-trump-says...

    We're going to get drug costs down at levels that nobody has ever seen before," Trump said. Shares of CVS fell 5.35% to $46.73, Cigna slipped 2.6% to $274.63, while UnitedHealth was down 3.54% at ...

  8. What is a fair-catch kick? Chargers' Cameron Dicker converts ...

    www.aol.com/fair-catch-kick-chargers-kicker...

    On a fair-catch kick, the ball does not have to be snapped, and the kicker can have a bigger running start before kicking the ball. Essentially, it's just like a kickoff attempt but with a holder ...

  9. Chess' future looms over the world championship, once again ...

    www.aol.com/chess-future-looms-over-world...

    The series was tied 7-7 after three weeks, with Ding recovering from a terrible start to clinch a comeback victory. It was a proud moment for China and affirmed its status as a chess superpower.