electromagnet and PSU

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hello,
i'm trying use elctromagnets arduino...building them shown here:
http://education.jlab.org/workbench/magnetstand/coil.html

that project calls psu @ 3.3 amps, 12v...i have 12v psu @ 5 amps.

when put electromagnet in circuit...just using 12v, 5amp relays...if have polarity of electromagnet 1 way...it kills psu , no power...when reverse polarity of wires...everything works fine in circuit. i'm curious why be...i haven't messed around making electromagnets before. they're curious!

thanks info!

quote
if have polarity of electromagnet 1 way...it kills psu , no power...when reverse polarity of wires...everything works fine in circuit.

no sure wrong. doesn't make sense @ all. not how coils work, reverse power , reverse field. must doing else.


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