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如图甲所示,电源电压保持不变,小灯泡额定电压6V.闭合开关S后,当滑片P从最右端滑到最左端的过程中,小灯泡的I﹣U关系图象如图乙所示.求:

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      Before the spring Festival, which is the most important festival in China, millions of passengers are struggling to make the once-a-year trip home. Because of a power failure caused by snow, more than 136 trains were forced to stay in Hunan Province. Almost 150,000 passengers were stopped from going back their homes. It's reported that the losses will be 111.1 billion yuan.  

In central China's Hunan Province, one of the worst hit area, seven people have died and snow is affecting(影响) the lives of 25.22 million people in 14 cities and 112 counties across the province. Though the power supply resumed(恢复) at 4:00 p.m. Saturday, 50 trains remain stranded (滞留) between Hengyang City in Hunan and Guangzhou provinces. And in Guangzhou, an official with Guangzhou railway authorities said the number of stranded passengers in Guangzhou City alone could hit 600,000 on Monday if the situation continued.

How to solve the problems as soon as possible? In order to help the passengers meet their families and solve the traffic problems, our government do what they can. First, The Ministry of Railways Ordered 63 trains to go to Guangzhou via (通过) the Beijing-Kowloon Railway Line or Shanghai-Kunming Railway Line instead of the Beijing-Guangzhou Railway Line. Second, the ministry also organized 35 trains from Beijing, Wuhan and Nanchang cities to help transport the stranded passengers. The thirdly, Guangdong authorities sent 15 million text messages (短信)warning drivers not to take highways leading north. Some Guangzhou citizens try their best to help the stranded passengers, such as offering medicine, raising money and cooking free meals for the stranded students.

      The snow disaster(雪灾) is so terrible, but all of the Chinese and government is trying their best to succeed in beating it.