A bulb is made using 2 filaments . A switch selects whether the filament are used individually or in parallel . When used with a 15V battery , the bulb can be operated at 5W, 10W, or 15W. What should be the resistances of the filaments ? I got the answers for 5W nd 10W but the answer for 15W is given to be not possible...why?

Abbas , 9 Years ago

Grade 12th pass