I have no vocabulary for this, so forgive my clumsiness in explaining.
I need to hook up a power supply to use with solenoids and an Arduino, but I'm not sure where to cut it. Just before the power plug there is a thing (not sure of the name, bottom right of picture in the link below), do I need to cut before or after it?
Here is a link to the picture, I'm a new user so I can't embed it.
If you know the name of the mystery thing, I'd also love to know.