Defnyddiwr:Rhyshuw1/Anghyflawn
From Wikipedia, the free encyclopedia
Electric lights are used both at night and to provide additional light during the daytime. These lights are normally powered by the electric grid, but some run on local generators, and emergency generators serve as backups in hospitals and other locations where a loss of power could be catastrophic. Battery-powered lights, usually called "flashlights" or "torches", are used for portability and as backups when the main lights fail.
Defnyddir goleuadau trydanol yn ystod y nos ac ar gyfer golau ychwanegol yn ystod y dydd. Pwerir y goleuadau yma fel arfer gan y grid trydanol.