Battery: 1880 Italian physicist Volta made the world's first battery. 1860, Plante of France invented a battery with lead as the electrode. 1887, Englishman Hellesen invented the earliest dry battery. Telephone: 1876 Bell invented the magnet telephone and applied for a patent for it. On the same day, Gray, who invented the liquid phone, also filed a patent application. A lawsuit about the right of telephone discovery began, which lasted more than ten years. Finally, according to the fact that Bell's magnetic phone is different from Hugret's liquid phone and Bigret filed a patent application a few hours earlier, the court awarded the invention right to Bell TV: 1924, Baird invented the most primitive TV in Britain. American RCA 1939 introduced the world's first black-and-white TV set, 1953 formulated the national color TV standard, and 1954 introduced RCA color TV set. Motor: 1834 DC motor invented by jacoby, Germany 1888 AC motor invented by Tesla, Yugoslavia: 183 1 Faraday built the first generator prototype 1832. Inspired by Faraday's discovery, the Frenchman Pisci made the first generator by applying the principle of electromagnetic induction. Refrigerator: 19 13, Chicago, USA developed the world's earliest household refrigerator. This kind of refrigerator named "Dumel" is made of wood and has a compression refrigeration system installed inside, but the use effect is not ideal. 19 18, Cobrand engineers from KE-LVZNATOR company in the United States designed and manufactured the world's first mechanical refrigeration automatic household refrigerator. 1834, American engineer Jacob Perkins invented the world's first compression refrigeration device, which is the prototype of modern compression refrigeration system. In the same year, Perkins obtained the first patent of freezer issued by Britain. Electric light: 1879 Edison invented the first practical electric light. The era of oil lamps, candles and arc lamps has ended, and mankind has really entered the "bright era"
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