Scaffolded Video notes uses phet animation to demonstrate for students the key differences between series and parallel circuits. The animation does a great job of allowing students to see the path of electrons, how the flow rate of the electrons change, even if they haven't yet learned the concept of current or Amps yet. They see the effect of breaking the circuit on the flow of electrons in the two types of circuits. Students can also see the concept of resistance in action, by addin