Here we have an assortment of breadboard circuits build using 123D Circuits as part of my Robotics class. At the top is a simple LED Circuit powered by a 9 Volt battery. Bellow is a Series Circuit, powering 5 LED s using a single 9 volt battery. Finally, at the bottom is a Parallel Circuit with a single 9 volt battery used to power 3 LED s and a light-bulb.