Because, unlike a simple string of lights in a series circuit, these are all arranged in a parallel circuit. And you can think of a parallel circuit as having several different routes that all run ...

For example ... simple. There's an enormous number of circuit-building methods that I'd love to go over with you, but we're going to stick to the basics, which you'll use in every circuit problem ...

It's pretty difficult to find that one bulb that's causing the problem. However, this is a great time to look at the difference between series and parallel circuits. A Simple Circuit Just about ...