On the left a Circuit A, which is a square box. The top, left, and right sides have circles with X’s in them. The bottom side has a stack of vertical lines, which are from left to right very short, short, very short, short. On the right a Circuit B, which is a square box. 2 extra lines cross the box near its top, parallel with the top side. The top side and the 2 extra lines have circles with X’s in them. The bottom side has a stack of vertical lines, which are from left to right very short, short, very short, short.
Use the diagram and drop-down menus to answer each question.

Which circuit is a parallel circuit?

Which circuit is a series circuit?

In which circuit do the light bulbs all shine at their maximum brightness?