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Oct
26
comment Speed of electricity in cable
Remember that in classical electrodynamics, the energy transmitted from the source to the load in a current-carrying wire is not in general transmitted by the electrons themselves; it is carried by the electromagnetic field generated by accelerating charges (see en.wikipedia.org/wiki/Poynting_vector). In any circuit with loss, you must actually expend energy to overcome the loss and get the electrons moving such that the field is generated.
Aug
5
awarded  Nice Question
Jul
5
awarded  Yearling
Mar
7
answered Curl of Electrostatic Field
Aug
28
revised Kirchhoff current loop in Resistor Diode Ladder network
added 1 character in body
Aug
27
comment How far has a black hole to be in order for its tidal forces to disintegrate earth?
Related:physics.stackexchange.com/q/109505
Aug
27
revised Kirchhoff current loop in Resistor Diode Ladder network
added 233 characters in body
Aug
27
answered Kirchhoff current loop in Resistor Diode Ladder network
Jul
12
asked Lee Yang force and cosmology
May
7
awarded  Popular Question
Mar
18
awarded  Critic
Dec
28
awarded  Revival
Dec
4
awarded  Editor
Dec
4
revised Steady state of diffusion current in semiconductors
added 6 characters in body
Dec
3
answered Steady state of diffusion current in semiconductors
Dec
2
comment Power dissipated on internal resistance of short-circuited voltage source
When you calculate the power dissipated due to heating of the internal resistance when shorting the battery, you have to use the EMF $$\mathcal{E}$$ of the voltage source in your third equation, not the nominal battery voltage external to the internal resistance, $$V$$, as you have done. It then agrees with your final equation, and there is no contradiction.
Oct
13
comment Boundary conditions for 2D helical waveguide
@WetSavannaAnimalakaRodVance Wow, that's interesting. Do you have any references from that time period detailing these plans? It would make a really interesting read. Thanks again for the references on the helical waveguides - the math seems fairly involved so I will have to do some review of EM topics before I can fully understand them.
Oct
11
comment Boundary conditions for 2D helical waveguide
@WetSavannaAnimalakaRodVance Nice references, thanks!
Oct
10
asked Boundary conditions for 2D helical waveguide
May
16
accepted Capacitance of a conducting disk