Which bulb is really more collisions of electrons inparallel connection? Maybe we can easily get the conclusion about this question. The intensity of bulb's light is depend on the power of electricity(IV), so the upper blub has more number of collisons between electrons and atoms. but I think actually we consider about the numer of collisions the upper bulb flows 6A = 6*6.25*10^18 electrons, the resistor length is 1 the lower bulb flows 3A = 3*6.25*10^18 electrons, the resistor length is 2 so totally the number of collisions is same. so I think the intensity of two bulbs is same. How can I solve this problem?