Answer:
the both circuit are in a complete circle. the difference are the parallel circuit can evenly spread electrons between two object for example lightbulb where in a series circuit the object closer to the power source will always get more electrons and the object behind get less.
Step-by-step explanation:
for any circuit to work it need to be complete and requires to connect like the circle or the flow of electron will be broken and and it will not flow anymore. due to electrons wanting to seek out the fastest way to complete the loop so because in a parallel circuit there are two circles so when the electrons goes their a part of the electron split and travel that way to seek the closes way back therefor a parallel circuit can evenly deliver electrons to two object. in series the object closest to the power source gets the most electrons because there is only one way and the electron must pass through one object before it can pass through the one behind it making it slower and has less charge.
electron = current ,if you didn't know yet