| Circuit 1 
This IS a series circuit because there is only one path for current flow; all current passes through the resistor | Circuit 2 
This IS a series circuit because there is a single path for current flow -- all current passes through resistors R1 and R2. | Circuit 3 
This IS a series circuit because there is a single path for current through all four lamps. |
| Circuit 4 
This is NOT a series circuit because there is more than one possible paths for current flow -- the current through R1 is not the same path as current through R2. | Circuit 5 
This is NOT a series circuit because there is more than one path for current flow. Although all circuit current flows through resistor R1, resistors R2 and R3 offer two different paths for current. | Circuit 6 
This is NOT a series circuit because there is more than one path for current -- there is a separate path through each of the four lamps. |
