在“测定小灯泡的电功率”实验中,电源电压为6V,小灯泡L的额定电压为2.5V,电

题型:实验题

问题:

在“测定小灯泡的电功率”实验中,电源电压为6V,小灯泡L的额定电压为2.5V,电阻大约为10Ω左右,可供选用的滑动变阻器R1和R2的最大阻值分别为10Ω、50Ω,实验电路如图所示.

(1)应该选用的滑动变阻器是           (选填“R1”或“R2”)。

(2)电路正确连接后。闭合开关,发现小灯泡不亮,但电流表有示数,接下来应进行的操作是                                             

(3)如图是根据实验数据绘成的U---I图象。根据图象提供的信息,可计算出小灯泡的额定功率是          W。当滑动变阻器的滑片向左移动时,小灯泡的电阻将变          

(4)继续移动滑片,小灯泡突然熄灭,此时电流表示数为0,而电压表有示数,那么发生的故障是                   ,此时电压表的示数是           V。

考点:滑动变阻器欧姆定律及其应用电路的连接电路故障分析测量电功率的实验
题型:实验题

第三部分:写作(共三节、满分50分)

第一节:单词拼写(本题共10小题,每题1分,满分10分)

61. We mustn't judge persons by their a_____________.

I didn’t want to hurt you on p__________, but I meant no harm.

There is no d__________ that he is wrong.

In the big earth in Haiti, everything was d___________.

65. Tom is not good at English, so he can’t speak English f____________

66. She a__________ that she had stolen the bicycle.

67. A d           .  person always tries to finish the job, no matter how hard it is.

68.Nelson Mandela decided to attack the laws in order to make black and white people e____________.

69.I’ll be in c_________ of the whole company next week when the manager is away.

70.She said she didn’t like it, but p__________ I thought it was very good.

题型:实验题

离心式通风机的优点是()

A、结构简单

B、维护方便

C、噪声小

D、风量调节方便

E、并联工作稳定性差

题型:实验题

男性,45岁,长期吸烟,吸烟量在20支/日以上,有饮酒习惯,医生建议其定期进行口腔检查以早期发现可能的癌变,检查间隔时间为()

A.6个月

B.9个月

C.12个月

D.15个月

E.18个月

题型:实验题

治疗血虚生风化燥型旋耳疮的代表方剂是()

A.四物汤

B.地黄饮子

C.镇肝熄风汤

D.天麻钩藤饮

E.六味地黄汤

题型:实验题

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