试题与答案

在研究学习活动中,小美同学用如图所示的电路探究导体的电阻跟哪些因素有关,她选取了

题型:问答题

题目:

在研究学习活动中,小美同学用如图所示的电路探究导体的电阻跟哪些因素有关,她选取了6根金属丝.其材料、规格和测得的电压,电流值如下表所示,并计算出了每一根金属丝的电阻值.

金属丝代号材料长度l/m横截面积S/mm2电压/V电流/A电阻值/Ω
 ①镍铬合金1.81.01.50.752.0
 ②镍铬合金0.901.01.51.51.0
 ③镍铬合金0.451.01.53.00.50
 ④镍铬合金0.902.01.53.00.50
 ⑤镍铬合金0.900.501.50.752.0
 ⑥锰铜合金0.900.501.51.90.79
 ⑦镍铬合金3.60.5   

(1)请你利用代号为①②③的三组数据,在坐标系中画出R~L图线.

(2)金属丝代号为______的三根导线,是用来探究导体电阻与横截面积的关系,金属丝代号为______的两根导线,是用来探究导体电阻与材料的关系.

(3)根据表中数据所反映出的规律,可推知代号为⑦的金属丝的电阻值,请将结果填在表中.

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A, B, D, E

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In general, people talk about two groups of colors: warm colors and cool colors. Researchers in psychology think that there are also two groups of people: people who prefer warm colors and people who prefer cool colors.

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Red may be exciting, but one researcher says that time seems to pass more slowly in a room with warm colors than in a room with cool colors. He suggests that a warm color, such as red or orange is a good color for a living room or restaurant. People who are relaxing or eating do not want time to pass quickly. Cool colors are better for offices or factories if the people who are working there want time to pass quickly.

Researchers do not know why people think some colors are warm and other colors are cool. How ever, almost everyone agrees that red, orange, and yellow are warm and that green, blue, and violet are cool. Perhaps warm colors remind people of warm days and the cool colors remind them of cool days. Because in the north the sun is higher during summer, the hot summer sunlight appears yellow.

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B.Blue, violet.

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B.Orange for dining-rooms.

C.Blue for bedrooms.

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B.Warm colors remind people of warm days.

C.Cool colors remind people of cool days.

D.People have an agreeable opinion of warm colors and cool colors.

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