Energy and the Environment #4: Historical Scientist — Thomas Edison

Erin wants to know why we still use incandescent light bulbs, now that we have a more efficient alternative. Great question! And the answer is that they haven’t always been inefficient.

Thomas Edison invented the first practical incandescent bulb. One of the problems that he had to solve was finding the right kind of material to use for the filament. When he finally came up with using carbonized sewing thread, he made the incandescent bulb one of the most efficient light sources of his time.

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Segment 4 Download Links
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