when buying a lamp bulb does it tell the resistance rating when the filament heats up?
R Thread Starter relicmarks Joined Oct 13, 2006 355 Nov 4, 2008 #21 when buying a lamp bulb does it tell the resistance rating when the filament heats up?
beenthere Joined Apr 20, 2004 15,819 Nov 4, 2008 #22 Not as such - you have a voltage rating plus the current. As R = E/I, you can calculate it.