The energy required to illuminate this particular lamp does not come from electricity, but from gravity. This gravity lamp developed by two designers can convert gravity into electrical energy. Tie a certain weight object to one end of the hanging rope and raise it to the top of the lamp. Electric energy will be generated during the descent of the weight. Let the lamp shine and the weight drop time reaches 30 minutes, which means that the lamp can continue to shine for 30 minutes. In addition, the electricity generated can also be provided to small appliances such as mobile phones and MP3 players, which is more convenient than solar power generation. If this device could become commonplace it would bring about a green revolution.
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