Can I set my variable voltages to +-6V and have that act as a 12V drop providing 1A?
What is a +-6V supply?
One supply is +6V, and another is -6V, both providing 500mA.
As ajofscott said, supplies in series don't add current. So a 500mA supply in series with a 1A supply can still only provide 500mA.
This makes sense, thank you both.
Even if I tied the -6V to the ground rail of the breadboard? The Arduino isn't part of this circuit, so I'm not worried about that.
What would that accomplish?
I don't know, that's why I'm asking. I had it in my mind that I could use the -6V as ground, and have it "pull" 500mA while the +6V acts as the voltage source, "pushing" 500mA. Total voltage drop is 12V and if current sources added (which obviously they don't) I'd get 1A.