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[[Image:Clipped_plug.jpg | 325 px ]] [[Image:Assymetrically_clipped.jpg | 400 px]]
# With the DC voltage setting on the multimeter in the appropriate range, identify which is the positive and which is the negative wire coming from the adapter. The voltage setting on the multimeter dial is shown below. The number at top will display the current voltage.
[[Image:Voltage_setting.jpg| 400 px]]
## WARNING: To do this you need to plug the adapter into the wall. Be sure that you do not touch the two wires together, this will short out your power supply. If it is easier, use two of the alligator cable to cover the free ends of the wires.
##Is the positive wire labelled in any way? Attach a red alligator cable to the positive wire, and a black alligator cable to the negative wire. This is the standard color code for positive and negative wire.