Re: MIT's Walter Lewin's twice surprises the EE professors! (fun)
I don't get the last paragraph of the first page.
"There is no electric field in this loop if the resistance of the wire
making up the loop is zero."
He is idealizing isn't he. If the wire is really a perfect conductor
why would force be needed to keep them moving along. It is like no
friction. Not the case for a real wire but so what? Its an adealization
where all the resitance is put into the resistor.
.
Relevant Pages
- Re: Is electromagnetic field theory unified?
... If he jumps you know you got those 50,000 Volts in the wire. ... The electric field tells nothing about the story. ... Nevertheless you only have those charges if you place ... can accumulate in the electrical terminals of the said loop of wire. ...
(sci.physics) - Re: More on cheater plugs
... with unbalanced interconnects, that have their 3rd ... wire safety pins connected to each other, ... There is a closed loop path for electrons. ... Bulgin plugs are debatably better. ...
(rec.audio.opinion) - Re: More on cheater plugs
... interconnects, that have their 3rd wire safety pins connected to each other, ... BUT, for the sake of this gedanken experiment, the 3rd wire safeties are not ... There is a closed loop path for electrons. ... In such an environment balanced power would matter less. ...
(rec.audio.opinion) - Re: More on cheater plugs
... interconnects, that have their 3rd wire safety pins connected to each ... BUT, for the sake of this gedanken experiment, the 3rd wire safeties are ... There is a closed loop path for electrons. ... In such an environment balanced power would matter less. ...
(rec.audio.opinion) - Re: Beginner question on resistance
... condition) or open (alarm condition). ... The limit depends on how much current the alarm passes through the contacts (and the resistance of their wiring) and at what total voltage drop across that circuit, it decides that some switch is open. ... For instance, if the switch loop is fed with 10 mA and decides that an open condition is indicated at a voltage drop of 2 volts, then the total resistance of the loop and all the switch contacts must drop less than 2 volts while 10 mA passes through them. ... For any reasonable gauge wire, that is a lot of length, but this example is completely hypothetical. ...
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