GK
INVENTIONS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It did not last but for a few days.
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It lasted for over a year.
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It was too expensive to make.
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It got too hot and burned people.
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It would turn off and on sporadically.
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Detailed explanation-1: -These early bulbs had extremely short lifespans, were too expensive to produce or used too much energy. When Edison and his researchers at Menlo Park came onto the lighting scene, they focused on improving the filament–first testing carbon, then platinum, before finally returning to a carbon filament.
Detailed explanation-2: -Turning a light bulb on sends a jolt of electricity through the filaments, which is more likely to break it than a continued current-that’s why light bulbs often burn out as you turn them on. If you turn lights on and off frequently, you’re likely reducing the lifespan of the bulb.
Detailed explanation-3: -Inside a glass bulb that was almost a vacuum, it was able to stay lit for 13.5 hours. In the end, Edison’s “three or four month” project had taken him 14 months.