八上科学作业本A(紫的那个) 第四单元 复习题答案 实在没 追+20分
实在没全部的话就给19---24题的吧 追+20分
推荐回答(3个)
1.D 2.D 3.C 4.A 5.D 6.C 7.A 8.D 9.C 10.D 11.绝缘 导体 并联 不会 串联 12.控制变量 电阻 电压 13.减小 温度升高,灯丝电阻增大 14.串联 AP 增大 减小 变暗 15.铜 镍铬合金 16.变大 变大 17.左 10 3 18.略 19.(1)伏安 (2)略 (3)变大 20.(1)略 (2)不成正比 (3)逐渐减小 21.该实验方案存在三个不足:①电源的电压超出了灯泡的电压;②只选择了一组规格相同的灯泡;③只根据一次测量数据得出结论的实验方法不恰当。改进措施:①选用2节干电池串联做电源或者增加一个滑动变阻器;②应选用多组不同的灯泡做实验;③应分析多次测量的实验数据得出结论。 22.(1)电阻最大处 (2)B (3)闭合开关,调节变阻器滑片,分别读出定值电阻两端的电压表的读数和相应电流表的读数,比较每次的电压与电流的比值是怎样变化的 (4)控制变量 23.电阻为3Ω,电源的电压为3V 24.(1)小 (2)略 (3)110Ω (4)0.024A 72℃
19.吹来 风级
20.陆地 陆地
21.减小压力 压力减小 压强增大
22.太阳辐射 低 高
23.气泡应从小到大
24.4000
没有错的话。。。
19(1)伏安(2)略(3)变大。
20.(1)略(2)不成正比(3)逐渐减小
21.该实验方案存在三个不足:①电源的电压超出了灯泡的电压;②只选择了一组规格相同的灯泡;③只根据一次测量数据得出结论的实验方法不恰当。改进措施:①选用2节干电池串联做电源或者增加一个滑动变阻器;②应选用多组不同的灯泡做实验;③应分析多次测量的实验数据得出结论。 22.(1)电阻最大处 (2)B (3)闭合开关,调节变阻器滑片,分别读出定值电阻两端的电压表的读数和相应电流表的读数,比较每次的电压与电流的比值是怎样变化的
我的技术只有这点~~
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