parallel:


series circuit:



This is because each bulb in parallel uses the entire potential difference of the power source, whereas in series, the bulbs act as potential dividers, reducing the voltage across the others and therefore the current passing through all of them.
http://wiki.answers.com/Q/Why_when_light_bulb_is_arranged


i GUESS what they're trying to say is that in the potential difference in parallel are all used up. (hello electrons) In series, the bulbs acts as the aforementioned potential dividers and i think that causes resistance more resistance so currant is less adn the bulb is dimmer.

i found this video but they guy was talking about electrons and protons aka sec 4 stuff. so i guess i'm just going to put it over here so i can refer to it when i'm feeling bored and have nothing better to do. Hey, i might as well learn something useful. :D haha. Anyway, here it is:
oh yea and PS: the guy made a couple of jokes in the beginning. you can skip that.



so, how do you feel after watching the video? confused? anyway, now this is sec 2 work so it's MUCH more easier to understand:



hope you enjoyed them all!