1. The problem statement, all variables and given/known data Rank the brightness of five bulbs (3 different circuits) considering all the batteries and light bulbs are identical. 1st circuit - 1 battery hooked to bulb A. 2nd circuit - 1 battery with positive end hooks to bulb B then bulb B connects to bulb C then comes back to negative side of battery. (series) 3rd circuit - 2 batteries (series) with positive end of first battery hooks to bulb D then bulb D connects to bulb E then comes back to negative side of other battery. 2. Relevant equations V=IR 3. The attempt at a solution I think it's this...A=D>E>B>C... I think I am missing something really important...question seems to be so...simple!