Current Carrying Capacity of cables with different voltages

[D Skelton]

'Thou shalt not question Stephen Fry' - Wasn't that like the 11th commandment or something?! Lol

 

[shanky887614]

In Ac circuits the electrons vibrate pretty much around their own original position so no actual electron migration and in DC the electrons move so slow it make a snail look fast ....... look up 'speed of electricity' on Wiki and learn why everything you are taught is dumbed down and a lie just to make sure you dont get brain overload ..... classical physics is all you need to know .... advanced physics first rule is forget all the crap you were ever taught.

@sparky 351335 .... 300,000m/s is the speed of the propagation of the EMF not the electrons whizzing around as your answer implies if your going to google it make sure you understand what you read..

Simplist way to explain it.

Get a tube 5m long and fill with marbles. As you push one more in from one end another pops out the other but the ones inbetween move incredably slowly

 

[Darkwood]

Depends who your trying to explain this to shanky your explanation works to explain the speed concept but has the confusing angle of making one think the electrons (marbles) are delivering the energy but when you do this concept with AC you have no NET migration so yes it may satisfy the those who just need a visualisation of how it works but this is again a false concept to simplify the workings of the quantum realm.... ive studied quantum theory for 30yrs and it still screws my mind up because its a world that dosn't follow the rules of the Macro world so trying to convey it to someone who only know the real world is practically impossible....

 

[shanky887614]

Depends who your trying to explain this to shanky your explanation works to explain the speed concept but has the confusing angle of making one think the electrons (marbles) are delivering the energy but when you do this concept with AC you have no NET migration so yes it may satisfy the those who just need a visualisation of how it works but this is again a false concept to simplify the workings of the quantum realm.... ive studied quantum theory for 30yrs and it still screws my mind up because its a world that dosn't follow the rules of the Macro world so trying to convey it to someone who only know the real world is practically impossible....

True but its the easiest way to explain how something as slow moving as an electron can have a much larger affect. Quantom physics themselfs are complex because most people try to use known laws that act completely different in reguards to quantom science.

 

[Tiny Spark]

All you need to know is what they tell you in school that electric goes from + to -!

Oh wait...

 

[shanky887614]

All you need to know is what they tell you in school that electric goes from + to -!

Oh wait...

Lol that messes with a lot of peoples minds.

I forget which but electrons flow from pos to neg but electricity from neg to pos

 

[Des 56]

There must be "holes" in these arguments about the flow of electrons

I think its probably best to leave the quantum state to DW
Even with his extensive knowledge,to quote Richard Feyman,
"I think I can safely say no one understands quantum mechanics"

So there we are,there seems little hope of the likes of us getting to grips with this subject,at least not by the end of this thread :blush5:

 

[D Skelton]

What's more, we also know either our current quantum theory or our theory of relativity is wrong, maybe even BOTH, so essentially we're all basing our sums on something which is a coin flip at best!

 

[Darkwood]

Its not that its wrong its the quantum equations we have prove very precise and accurate what is wrong with them is unification of different areas of the quantum world namely gravity, we hae well founded and tested equations that can explain differing areas of the quantum world but we dont have one that links them together or TOE (Theory Of Everything).

As we progress and discover more like last years big find (Higgs Boson) the elusive giver of mass and the recent discovery of new exotic particles the links between the various areas are slowly been made.... dark matter should hopefully be detected within the next 5yrs 'IF IT EXISTS!!!'

 

[Gardner]

I would think it would be the same. Heating is a function of current rather than voltage. Now if your cable is exposed verses imbedded in insulation than there would be a difference from smothered heat dissipation.