It's not a parallel circuit. It's a series circuit. If you have 100 bulbs in series, each is getting 1.1V across it. If half of them burn out (and, as the arti

It's not a parallel circuit. It's a series circuit. If you have 100 bulbs in series, each is getting 1.1V across it. If half of them burn out (and, as the article explains, become a short-circuit), then you have 50 bulbs, and each is getting 2.2V across it.