just plug it into ur GP if its the wrong pol. it just wont work, i wont do any damage, i had an adapter that i didn't know wheather it were rite or wrong so i just bunged it in, it were wrong and just didnt do anything so i made a pol. converter and it works fine
eh? A bulb would work either way around. A multimeter would be the best way. If you place the red probe in the centre and the black probe on the outside and it shows a negetive value, it's centre-negetive, and a positive value means centre-positive (as long as your probes are in the right terminals - black negetive, red positive on the multimeter).
And also, you can very easily fry devices by putting the wrong polarity across them, especiually with a high-output (amps, or in this case, milliamps) transformer.
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