Lecture 6 - Lord Kelvin and the transatlantic...

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Lord Kelvin and the transatlantic cable. How does the signal (dots and dashes) attenuate with distance along the cable? The so-called “cable equations.” (1824-1907)
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The attenuation of the signal with distance to ~1/3 its value is one space constant ( λ ).
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Membrane capacitance and resistance Most biological membranes have a unit capacitance (C M ) of ~1 μ F/cm 2 . The membrane resistance of biological membranes varies dramatically depending on which channels are open. Membrane resistance can change over a few milliseconds as channels open or close.
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