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Physics Forums's title: Physics Forums | Science Articles, Homework Help, Discussion

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Message History

Why does voltage drop become more noticeable in longer LED circuits?
I've been trying to understand voltage drop in longer low-voltage LED circuits from a physics perspective.

If the supply voltage is constant, increasing the length of the conductor increases the total resistance. With the same current flowing through the circuit, this should produce a larger...


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Attempt to resolve the ALD radiation drag paradox
1. In classical electrodynamics, the symbol R appears in two entirely distinct equations and represents different physical quantities. When calculating the resistive force from the radiation field, R stands for the retarded distance — the propagation distance of a signal traveling from...

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Huge original computer is still around
The Aiken calculator still exists at Harvard, or at least it did in 1978. I happened across it one day in the lobby of one of the science buildings. No one else was around.



It has a drive shaft with a universal joint, like one would expect on a tractor.

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A Chaotic Equation of Prime Number Distribution
dz/dt = (1/ln t)·z² - (2/ln t)·z̄ + γ·sin(γ₁t) + δ·η(t)​This is a non-autonomous dynamical system defined on the complex plane, with each term's structure corresponding to mathematics/physics as foll...

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Solar Activity and Space Weather Update thread
I am picking this up as a continuation and extension of the idea laid out e.g. in @davenn 's thread
"The Sun today - 9 July 2017 - nice spot group"

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