how does a three way light bulb work
3-way lamp The two filaments can be activated separately or together, giving three different amounts of light. A typical 3-way incandescent bulb is a 50 W / 100 W / 150 W bulb. It has a low-power 50 W filament and a medium-power 100 W filament. When they are both energized at the same time, 150 W of power is delivered, and a high level of light is produced. Usually screw-base 3-way bulbs fit into regular Type A sockets. Larger 3-way bulbs (up to 300 W) have a larger "mogul" base. These 3 way bulbs can also come in spiral designs. [3]
Traffic light In Australia a white "B" or "T" sometimes replaces the green light indicating that buses or trams (respectively) have right of way.
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3-way lamp The center contact of the bulb typically connects to the medium-power filament, and the ring connects to the low-power filament. Thus, if a 3-way bulb is screwed into a standard light socket that has only a center contact, only the medium-power filament operates. In the case of the 50 W / 100 W / 150 W bulb, putting this bulb in a regular lamp socket will result in it behaving like a normal 100W bulb.