Tesla's "COIL FOR ELECTRO-MAGNETS".

[synchro1]

You snap it across battery electrodes. You need to charge the coil to get it to work. That's where it gets the 250,000 times the potential between the windings. The same goes for the nail and paper clip magnetic strength test. You need to induce the Hi-voltage into the coil , it dosen't show up from nowhere! Think about it!

[MileHigh]

Shortly after the battery disconnects the coil is back to normal.  It doesn't remain charged.  Your comment is silly.

[synchro1]

Says you! It needs a solid WHACK, not just regular current run through.

[conradelektro]

For people who are willing to learn:

The ability of an inductor to store energy in the form of a magnetic field (and consequently to oppose changes in current) is called inductance. It is measured in the unit of the Henry (H).

http://www.allaboutcircuits.com/vol_1/chpt_15/1.html

"So, if you send a current through a coil, the magnetic field strength depends on the inductance of the coil and on the amount of the current. If the inductance of two coils is equal, for every amount of current sent through the two coils there will be an equal magnetic field strength."

Why do you think people invented the term "inductance" and use it?

I am just a beginner, but I have learned some basics. The idea is to learn, not to talk like a Parrot who does not know what it is saying.

And again I made a grave error. One should not respond to silly posts, it encourages the idiot to post again some nonsense. I will not do it again. I wanted to be nice and do an experiment because I found some material in my lab, but whatever one shows, the idiot will talk around it.

Greetings, Conrad

[synchro1]

My first serial bifilar was shop wound, 800 turns, filled with welding rods. I was testing it's magnetic strength running dc current through it with a 12 volt battery, then suddenly a shock went through the coil and when re-connected, it pulled a cutlery case all the way across the kitchen counter, scaring me. I don't need to read any text material from you to help me understand my experience.


Try and impulse charge the serial pancake with high voltage, then retest it and see if it makes a difference.