g4ph-h7l_aM[/youtube] This is pret... appear at all? Can we discuss this effect?
jim hardy said:you're tapping my oldest memory banks now.
when i was a kid had a next door neighbor hwo was a sort of Sorcerer's Apprentice, making Jacob's Ladders and the like.
I think you'll find the arc went up by simple convection like the smoke did. The ionized air is very hot...
there is a force on the charge that is moving through the arc, Q X Velocity (cross) B
but shouldn't that twist the arc parallel to conductors?
i didn't notice that in the video..
This is pretty old but it just crossed my mind. Wanted to share it with you guys.
One question though, why is that current arc going upwards? And why did it appear at all?
Can we discuss this effect?
gnurf said:Tree branch "falls" on power lines? From nowhere on a relative wind-free day with cameras ready? Admit it, you threw it up there didn't you?
jim hardy said:""""But this is AC, how does lorentz force apply to this when we have alternating B field."""
B alternates certainly, and so does Velocity (current in the arc is alternating )
i think you're right - if i remember how to cross vectors, the result also alternates direction hence nets to zero... mumble mumble...c'mon old brain,,, V X B--- rotate V into B and result is direction a right hand thread would move?
was hoping youd reaffirm my old memory because i don't have my books handy. (visiting friends away from home)
am i right , my kind friend?
dlgoff said:This old video shows what it looks like when transmission line phases arc.
jim hardy said:memory - i can almost remember when i had one...
jim hardy said:that last video is intentional opening of a disconnect switch in that yard. first second you can see it swing away... that kind of switch cannot interrupt load current, but the simple charging current makes a plenty impressive arc.
so judging by lack of excitement by participants that video, the current was pretty small. i didnt notice molten metal falling...
Maybe I was your neighbor. I've still got my 9KV neon sign transformer.jim hardy said:when i was a kid had a next door neighbor hwo was a sort of Sorcerer's Apprentice, making Jacob's Ladders and the like.
jim hardy said:power side of EE is to me more interesting than computers.
i honestly considered programming but decided it's more fun to magnetize iron by the ton than by the micron.
i was happy with DOS and QBASIC.
but that's just me.