A three-way 240 V lamp bulb that contains two filaments is rated for 150-300-450 W. One filament burns out. Afterward, the bulb operates at the same intensity (dissipates energy at the same rate) on its lowest as on its highest switch positions but does not operate at all on the middle position. What are the (a) larger and (b) smaller values of the filament resistances?
A three-way 240 V lamp bulb that contains two filaments is rated for 150-300-450 W. One...
5. A three-way lamp has four switch positions: off, low, medium, and high brightness settings when used with a working three-way light bulb. Such a bulb has only two filaments; when connected to 120-V household circuit one filament dissipates 60W of power while the other filament dissipates 120W. (a) Calculate the resistances of the two separate filaments. b) Explain how current must flow through the bulb to dissipate 180W at the fourth switch position. c) The most common way for...