您所在的当前位置：初中物理试题

> 小明准备按图（甲）所示的电路图测量未知电阻的阻值．实验过程中，当小明连好并接通电路时发现电压表指针的偏转情况如图（乙）昕示．（1）用图（甲）所示电路测量未知电阻所依据的原理是_________；（2）产生图（乙）所示情况的原因可能是（只要求写出2个）： ①_________． ②_________．

问题：

发布时间：2024-09-11

小明准备按图（甲）所示的电路图测量未知电阻的阻值．实验过程中，当小明连好并接通电路时发现电压表指针的偏转情况如图（乙）昕示．

（1）用图（甲）所示电路测量未知电阻所依据的原理是_____；
（2）产生图（乙）所示情况的原因可能是（只要求写出2个）： ①_． ②_____．

参考答案：

提问用户：FI***gHh

可能感兴趣的题目：

1 个位上数字是a，十位上数字是b，百位上的数字是c的三位数与把该三位数的个位数字、百位数字对调位置后所得的三位数的差为（）。
2 下列句子朗读停顿不正确的一项是 [ ] A．中／峨冠而多髯者／为／东坡 B．复／行／数十步 C．舟首尾／长约八分／有奇 D．树树／皆／秋色，山山／唯／落晖
3 水稻是重要的粮食作物，右图所示为一水稻植株，下列相关叙述错误的是 A．茎内的木质部运输有机物 B．根尖伸长区长得最快 C．根系为须根系 D．种子内含有一片子叶
4 —What did Tom do last Friday night? —He did nothing. He just___ _ on the street. [ ] A.ran after a dog B.played football C.hung out D.went shopping
5 如图，抛物线与轴交于A、B两点（点A在点B左侧），与y轴交于点C，且当 =O和 =4时，y的值相等。直线y=4x-16与这条抛物线相交于两点，其中一点的横坐标是3，另一点是这条抛物线的顶点M。 (1)求这条抛物线的解析式； (2)P为线段OM上一点，过点P作PQ⊥ 轴于点Q。若点P在线段OM上运动（点P不与点O重合，但可以与点M重合），设OQ的长为t，四边形PQCO的面积为S，求S与t之间的函数关系式及自变量t的取值范围； (3)随着点P的运动，四边形PQCO的面积S有最大值吗？如果S有最大值，请求出S的最大值并指出点Q的具体位置和四边形PQCO的特殊形状；如果S没有最大值，请简要说明理由； (4)随着点P的运动，是否存在t的某个值，能满足PO=OC？如果存在，请求出t的值。
6 The boy"s name is Kevin Smith. Kevin is his _____ name and Smith is his _____ name. [ ] A. last; first B. family; given C. given; full D. first; last
7 填空。（1）海日生残夜，___________________。（2）___________________，浅草才能没马蹄。（3）夕阳西下，___________________。（4）___________________，思而不学则殆。（5）中华人民共和国第七届城市运动会于2011年10月16日在南昌召开，如果你是运动会筹备委员，请你引用《〈论语〉十则》中的话作为欢迎全国各地运动员的宣传标语，这则宣传标语应该是：“___________________，___________________？” （6）《观沧海》一诗中最能表达诗人曹操远大抱负的诗句是：___________________，___________________；___________________，___________________。
8 已知直角三角形的两边长为3厘米和5厘米，则第三边长为（）。
9 看下图回答问题。（1）上图是阿拉伯数字，5个空格所代表的数字依次是___________________ （2）这些数字是由谁发明的？又是怎样传到西方的？ _____________________________________________________
10 阅读理解。 In a New York street, a small truck hit a big tree. The truck was full of glasses and they were all broken. The driver came out of the truck and looked at the broken glasses. He was very sad and people in the street felt sorry for him. Then an old man walked over to the driver. He looked at him for a few minutes and said, "My poor boy! I think you must pay a lot for this." "Yes," was the sad answer. "Well, well," said the old man, "hold out your hat, here"s some money for you, and I can say that some of these people will give you a helping hand, too." Then he walked away. The driver held out his hat and over a hundred people came and put their money in it. At last, the driver took out a bag and put all the money in it. Then he looked at the people and said, "Well, thank you very much. But you didn"t know that the old man is the owner of the truck. I"m driving and making money for him." 1. What did the truck hit? A. An old man. B. A big tree. C. Some glasses. D. A big hat. 2. How did the driver feel when he looked at the broken glasses? A. Afraid and excited. B. Pleased and frightened. C. Unhappy and worried. D. Surprised and happy. 3. Why did people give the driver money? A. Because they felt sorry for him. B. Because the knew the old man. C. Because they wanted to help the old man. D. Because they were the driver"s friends 4. From the passage we know that _____ . A. The old gave the young man a hat B. The old man was the driver"s father C. The driver became rich D. The driver had to give the money to the old man