"Steve R." writes:


I have an old fleamarket growler for checking electric motor
armatures. It warns not to be turned on without armature in V. My
physics has faded over the years, what will happen with an incomplete
magnetic circuit? Can this be modified to use as a de-magnetiser or
is it a piece of junk just worth the copper?

Thanks, John.


Wire a light bulb into the circuit. It will work as a current limiter.

Yes, a lamp is an excellent current limited.
Why? Its impedence varies with current....
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