题目

把两只灯泡并联后接到电源上，闭合开关，发现灯泡L1比L2亮，则下列说法正确的是（  ） A.通过L1的电流大         B.通过L2的电流大     C.L1两端的电压大         D.L2两端的电压大 答案：A思路点拨：灯泡的亮暗与灯的实际功率有关，L1比L2亮说明L1的实际功率比L2大。并联时灯两端的电压相等，根据P=UI可得，流过L1的电流比L1大。 全程精解：A 误区分析：在电学中首先要分析电路的连接方式，不同电路的电流、电压和电阻的关系是不同的。短文填空。      Long long ago there was an old woman.She made a l   1    by planting f   2   .One daya young man passed by the large beautifulgarden. He was i   3   in these beautifulflowers, and i   4 _  how happy he could be    5   he had so many flowers. And if he soldthe flowers, he could make much money, then he will get a good e   6   and he will have ac  7 to travel around the world. So hewanted to get some and plant them in hisgarden. So he t    8   the old woman about hisdream. The old woman told him, "I am a    9your ideas. I just want to be happy,  and I thinkif you give your money to the c   10  , youwill be happier,  because you help others. The young man said nothing and knew what to do.1._______2._______3._______4._______  5._______6._______7._______8._______9._______ 10._______