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题小明注意到家中的灯泡比平常亮,猜测可能是电压超过了220V,为了证实他的猜想,他做了如下的实验,关闭家中的其他电器,只开了一只“220V 100W”的电灯,观察家中标有“3000R/Kwh”的电能表在20min内转了121转求 (1)这只灯的电阻是多大? (2)在20min内这只灯消耗的电能是多少? (3)小明家此时的实际电压是多大? (4)为了使这只灯正常发光,应串联一多
Xiao Ming noticed that the bulb in the home was brighter than usual. He guessed that the voltage might be more than 220V. In order to confirm his conjecture, he did the following experiment and turned off the other appliances in the home. He only opened a 220V 100W. In the lamp, the watt-hour meter marked “3000R/Kwh” in the home was turned for 121 turns in 20 minutes. (1) What is the resistance of the lamp? (2) What is the power consumed by this lamp in 20 minutes? ( 3) What is the actual voltage of Xiaomingjia at this time? (4) In order to make this light shine normally, it should be connected in series.