Wed post

To answer the question. The relationship between brightness and current. The greater the current the brighter the bulbs burn. When in series, the bulbs split the current and will progressively burn less bright because the current is split between all the resistance ( bulbs). When in parallel, the bulbs burn equally bright because they draw an equal amount of energy from the battery and thus pull equal amount of current creating and equal amount of brightness in each bulb. The series battery will last longer although bulbs burn less brightly, the parallel bulbs will burn the battery out faster because they simultaneously "draw" more power from the battery.
Kim B