The process of making an incandescent light bulb. Old light bulb factory in Japan

In the manufacture of light bulbs, filaments, glass casings and bases are manufactured separately and then assembled into final product. From past records we know that 2

SOLVED:Some light bulbs have three power settings (not including zero), obtained from multiple filaments that are individually switched and wired in parallel. What is the minimum number of filaments needed for three power settings?

Before bendable tungsten filaments were developed, Thomas Edison used carbon filaments in his light bulbs. Though carbon has a very high melting temperature (3599^∘ C), its sublimation rate is high at high temperatures. So carbon-filament bulbs were kept at lower temperatures, thereby rendering them dimmer than later tungsten-based bulbs. A typical carbon-filament bulb requires an average power of 40 . W, when 110 volts is applied across it, and has a filament temperature of 1800^∘ C Carbon, unl

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