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A Three-Way Light Bulb and Parallel Wiring Within the bulb there are two separate filaments. When...

A Three-Way Light Bulb and Parallel Wiring Within the bulb there are two separate filaments. When one burns out, the bulb can produce only one level of illumination, but not the highest.

Are the filaments connected in series or parallel?

How can two filaments be used to produce three different illumination levels?

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