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Breadboard Setup and Voltage Supply:
# Connect the positive and negative rails running along the top and bottom of the breadboard. (Red wire for positive and black wire for negative). Use the connectivity continuity setting on your multimeter to check the continuity on of the positive and negative rails. (pic)
# Clip the end of the power adapter off, save enough wire with the plug to reattach it later in the semester (i.e. do not cut it off too close to the plug or you will not be able to reattach and solder it later)
# With the DC voltage setting on the multimeter, identify the positive and negative wires coming from the adapter. Is the wire labelled in any way? Tie a know in the positive wire, so that it is shorter (preventing a short), and so you know which is which.