[Amps] Grid fuses (was: Life and gain of 3-500Z)

[Joe Subich, W4TV]

Rich writes: 
 
> Nothing.  Current is flowing vertically.  What is the direction of  
> the EMF?

How does current flow vertically in a helical filament?  

The current must flow in/along the conductor - that's substantially 
horizontal which if I remember my physics from 40 years ago makes 
the force vertical up or down depending on the direction of the 
current (clockwise or counterclockwise).  

73, 

   ... Joe, W4TV