lamps stay bright if you add more lamps in parallel. Parallel circuits are useful if you want everything to work, even if one component has failed. This is why our homes are wired up with parallel circuits. This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.