初中电学测试题

1、pushing a head, ea st, north, we st devel opment, facilitating shant y, complete xinche ng west roa d, stability and re construction of the street , star ding garde n built ce ntury gar den district, subject public housing construction, heati ng the gas expa nsi on a cce lerated impleme ntation, jin

2、g rui river and bridge style line soli d shaft, further expanded t he tow n devel opme nt. beautiful country adhere to t he adva nce a nd ty pical for a group t o lead. according t o "ecol ogical lay base d, and industry i ncreased income , and l ive upgra de civi lization, and culture ri ch co

3、nnotati on" of thought, caug ht built beautiful vill age, and whole village a dvance, a nd easily relocation, and "five modified threebuilt", proje ct near 30 a; depth i nto e col ogical, a nd i ndustry, a nd cult ure, and tourism, eleme nts, hig h standards ca ught party origi nal ci

4、ty liu, a nd ja de are xia ao, m odel vill age, in province city set has benchmark. f our is e qual be nefits to pr omote sharing, coordinate d devel opme nt of various social undertakings. in t he ca se of rigid spe ndi ng slowi ng revenue growth, increas e, financial 75% t o the people's livel

5、 ihood, the masses have m ore access i n the shari ng. cuoban somethi ng good and benefit. a dhere to t he affordabl e, best , carefully cuoban v illage oil , water and heat, cultural, city and county colum ns pra ctical, developments benefit families, bring more w elfare to the masse s. devel opme

6、nt of social conve nience. a cce ptance of bala nce d devel opme nt of com pulsory educati on through the national assessme nt, the county vocati ona l education ce nter was named "top s chool of vocational educati on in chi na", the thir d batch of nati onal reform and devel opme nt model

7、 t hroug h pr ovincial .five is to deepe n reform and i nnovation to break bottlene cks a nd e ndogenous development of effective fire. as an engi ne of dy namism, adding reform key to adopting reform measures stress energy and bre ak bottle neck s and prom oting dev elopment. pay close attention to

8、 the key areasof reform. conscienti ously im plement the provi ncial depl oyment a nd cancel, adjustment, t o undertake the a dministrative a pproval items a ccordi ng to regulation 347 to furt her improve a dministrative efficie ncy conti nui ng de epe ning reform for pov erty alleviation, speedi n

9、g up r ural land right registration certificati on pilot pr oject , encouragi ng the orderly transfer of land management, uti lize the la nd re sources, i n or der to pr omote scale manageme nt laid the foundati on. a ctively cultivate t he market. firmly establish a market-orie nted, nurt uring fam

10、ily farms, industrial users, pr ofessi onal coopera tion orga nization new market manageme nt main b ody 456, effectively improve t he industr y, inte nsive a nd marketization of encouraging support socialcapital i nto the small micro-cre dit, ur ban development, cult ure and touri sm, public servic

11、e s and other areas, easing dev elopment shortfall. topromote mass i nnovation. o support t he rural se ctor to use new thi nking a nd new idea s, creative w ork incentives such as a ctively pr omoting fina ncial i ntermediati on, bring added 159 in non public enterpri ses, i ndivi dually -1540, cre

12、ated a物理试题2021.9一选择题（222=44）1. 如右图当开关闭合时， 灯泡两端的电压l1和 l2都发光，此时电压表测l 2v量的是： 、l1 两端的电压b、l2 两端的电压c、l1 和 l2 两端的总电压d、电源的电压2. 如右图，当滑片p 向 a 端移动时，以下判定正确选项： a、通过电阻器的电流变小b、通过灯泡的电流不变c、电流表的示数变小d、变阻器接入电路中的电阻变小a3. 下图所示滑动变阻器四种不同接法中，当闭合开关，使滑片p向左滑动，滑动变阻器接入电路中的电阻变大的是：l 1sla pbcdcdcdcdapbapbapbapbabcd4. 如右图所示的电路中，电源电压为

13、6v，甲乙两灯规格相同，当闭···合开关 s 后两灯都不亮，现用电压表进行检测，ab两点间的电压为abc零， bc两点间的电压为6v，造成故障的缘由可能是：乙甲a、电源接触不良b、甲灯接触不良或灯丝断c、开关接触不良d 、乙灯接触不良或灯丝断开s5. 如右图所示，已知两只灯泡l1 和 l2 是并联 ,a 、b 表示电压表和电流表，以下说法正确选项：a、a 是电流表， b 是电压表c、a、b 都是电流表b、a 是电压表， b 是电流表d、a、b 都是电压表6. 对欧姆定律公式i u / r 的懂得，下面哪一句话错误？ a对某一段导体来说，导体中的电流跟它两端的电压成

14、正比；b在相同电压的条件下，不同导体中的电流跟电阻成反比；c导体中的电流既与导体两端的电压有关，也与导体的电阻有关；d由于电阻是导体本身的一种性质，所以导体中的电流只与导体两端的电压有关，与导体的电阻无关；7. 如下列图，电源总电压为6v 保持不变， r1 =5，r2=10，当开关s 由闭合到断开时，电压表v 的示数将 a由 2v 变为 6vb由 4v 变为 6vc由 4v 变为 2vd6v 保持不变8. 如图 2 所示， ab 和 bc是由同种材料制成的长度相同、横截面积不同的两段导体，将它们串联后连入电路中比较这两段导体两端 的电压及通过它们的电流的大小，有al 1·l 2 &#

15、183;bauab>ubc，i ab<i bcb uab<ubc，i ab=i bcc.uab>ubc，i abi bcd uab ubc，i ab<i bc9. 甲、乙两炉子通过的电流之比为2： 3，两端的电压比为1：5，就它们的电阻之比为 a10 ： 3b 3 ：10c 2 ：1d 3 ：510. 一段导体两端的电压为5v时，导体中电流为 0.5a，假如电压增大到10v，导体的电阻和电流分别为 a100.2a b 102ac101ad 201a11. 将"220v,100w的灯泡接入 110v 的电路中，灯泡的实际功率是a.12.5wb.25wc.5

16、0 wd.100 w12. 有一接在家庭电路上的灯泡，开关闭合时不亮了，用测电笔分别接触灯头的两个接线柱，pushing a head, ea st, north, we st devel opment, facilitating shant y, complete xinche ng west roa d, stability and re construction of the street , star ding garde n built ce ntury gar den district, subject public housing construction, heati ng t

17、he gas expa nsi on a cce lerated impleme ntation, jing rui river and bridge style line soli d shaft, further expanded t he tow n devel opme nt. beautiful co untry adhere to t he adva nce a nd ty pical for a group t o lead. according t o "ecol ogical lay base d, and industry i ncreased income ,

18、and l ive upgra de civi lization, and culture ri ch connotati on" of thought, caug ht built beautiful vill age, and whole village a dvance, a nd easily relocation, and "five modified threebuilt", proje ct near 30 a; depth i nto e col ogical, a nd i ndustry, a nd cult ure, and tourism,

19、 eleme nts, hig h standards ca ught party origi nal city liu, a nd ja de are xia ao, m odel vill age, in province city set has benchmark. f our is e qual be nefits to pr omote sharing, coordinate d devel opme nt of various social undertakings. in t he ca se of rigid spe ndi ng slowi ng revenue growt

20、h, increase, financial 75% to the people's livel ihood, the masses have m ore access i n the shari ng. cuoban somethi ng good and benefit. a dhere to t he affordabl e, best , carefully cuoban v illage oil , water and heat, cultural, city and county colum ns pra ctical, developments benefit famil

21、ies, bring more w elfare to the masse s. devel opme nt of social conve nience. a cce ptance of bala nce d devel opme nt of com pulsory educati on through the national assessme nt, the county vocati ona l education ce nter was named "top s chool of vocational educati on in china", the thir

22、d batch of nati onal reform and devel opm nt model t hroug h pr ovincial .five is to deepe n reform and i nnovation to break bottlene cks a nd e ndogenous development of effective fire. as an engi ne of dy namism, adding reform key to adopting reform measures stress energy and bre ak bottle neck s a

23、nd prom oting dev elopment. pay close attention to the key areasof reform. conscienti ously im plement the provi ncial depl oyment a nd cancel, adjustment, t o undertake the a dministrative a pproval items a ccordi ng to regulation 347 to furt her improve a dministrative efficie ncy conti nui ng de

24、epe ning reform for pov erty alleviation, speedi ng up r ural land right registration certificati on pilot pr oject , encouragi ng the orderly transfer of land management, uti lize the la nd re sources, i n or der to pr omote scale manageme nt laid the foundati on. a ctively cultivate t he market. f

25、irmly establish a market-orie nted, nurt uring family farms, industrial users, pr ofessi onal coopera tion orga nization new market manageme nt main body 456, effectively improve t he industr y, inte nsive a nd marketization of encouraging support socialcapital i nto the small micro-cre dit, ur ban

26、development, cult ure and touri sm, public service s and other areas, easing dev elopment shortfall. to promote mass i nnovation. to support t he rural se ctor to use new thi nking a nd new idea s, creative w ork incentives such as a ctively pr omoting fina ncial i ntermediati on, bring added 159 in

27、 non public enterpri ses, i ndivi dually -1540, created a氖管都发光，就此灯不亮的缘由可能是a.灯丝断了b. 零线断了 c. 火线断了 d. 地线断了13. 安装家庭电路时，为检测电路安装是否正确，在接通电源前将火线上的保险丝取下，换成一个额定电压为220v 的白炽灯泡，同时断开全部用电器的开关，接通电源后发觉灯泡正常发光，由此可以判定 a.电路安装正确b. 电路安装不正确，某处有短路c.电路安装不正确，某处有断路d. 条件不足，无法判定14. 同学试验用的电压表，当使用“+”和“ 15”两个接线柱时，电压表的量程和最小刻度值分别是 a1

28、5v，0.5v b 15v， 1v c 3v， 0.1v d 3v，0.05v15. 如下列图，将电压表先后并接在ab处、bc处、ac处，当开关 s 闭合后，电压表读数最大时，是接在a ac处bab处cbc处d三处一样大16. 有 l1、l2、l3、分别标有“ 220v 100w”、“110v 100w”、“ 36v 100w”字sabc l 1l2样，它们都正常发光时，就a、l1 亮b、l2 亮c、l3 亮d 、一样亮17. r1 、r2 两个电阻并联后接入电路中，它们的电功率之比p1：p2=9：4 就有 r1、r2 两个电阻阻值之比是： a、9：4b、4：9c、 3 ：2d、2： 318.

29、 一只“ 10v 5w”的甲灯和一只“ 6v 1.8w”的乙灯串联后接入电路中，两灯均能发光，比较它们的实际功率（不考虑温度对电阻的影响）就：a、甲灯大些b、乙灯大c、两灯一样大d、无法判定19. 教室里装有多盏电灯，每多开一盏灯，就教室内电路的a总电阻增大b总电压增大c 总电流增大d总电压、总电流都不变20. 小宁的探究小组在练习使用电压表时，军军把电压表接成了如图2-2 所示的电路当闭合开关时所发生的现象是：灯泡亮、电压表有示数灯泡亮、电压表无示数 灯泡不亮、电压表有示数灯泡不亮、电压表无示数21. 如下列图的电路中，闭合s,当开关 s 1 从断开到闭合的过程中，以下说法中正确选项as1闭

30、合后电流表a 1 、a2 示数相等bs1闭合后电流表a 1 的示数比 a 2 大cs1闭合后电流表a 1 、a2 示数大小无法判定ds1闭合后电流表a 1 的示数比 a2 小22. 如图电路，电源电压恒定，滑动变阻器r2 的滑片滑到a 端时，电阻r1 消耗的功率为7.2w，滑动变阻器 r2 的滑片滑到 b 端时，电阻 r1 消耗的功率为 0.8w，此时电压表示数为4v；就滑片在 b 端时，电流表的示数为 a.1.8ab.1.2ac.0.4ad.0.2a二·填空题（ 1 35=35）23. 一节干电池的电压是 ，对人体的安全电压是 ，家庭电路的电压是 ；24. 完成以下单位换算（1）7

31、.8m= ，（2）5×104v= kv= mv（3）250ma= a= a25. 把 r1、r2 两个阻值不同的定值电阻接入电路，已知 r1 两端的电压为 u1，r2 两端的电压为 u2 ，通过 r1、r2 的电流分别为 i 1、i 2；如 u1=u2 ，就 p1：p2 =，如 i 1=i 2，就 p1： p2=；26. 在家庭电路中，表用来测量用户消耗的电能；标有“220v 2000w”字样的电热水壶正常工作 3 分钟，消耗电能千瓦时；27. 城市交叉路口通常都装有红、 黄、绿三色灯来指挥车辆、 行人通行，如每只灯规格都是“ 220v 300w”，就每组交通指挥灯（含红、黄、绿三种

32、颜色灯）工作15 小时要消耗电能焦；28. 三个阻值相等的电阻 ,串联后的总电阻是180，那么 ,它们并联后的总电阻是；29. 有一根镍铬合金线，两端电压为6 伏时，通过合金线的电流为0.3a，就镍铬合金线的电阻2pushing a head, ea st, north, we st devel opment, facilitating shant y, complete xinche ng west roa d, stability and re construction of the street , star ding garde n built ce ntury gar den dis

33、trict, subject public housing construction, heati ng the gas expa nsi on a cce lerated impleme ntation, jing rui river and bridge style line soli d shaft, further expanded t he tow n devel opme nt. beautiful country adhere to t he adva nce a nd ty pical for a group t o lead. according t o "ecol

34、 ogical lay base d, and industry i ncreased income , and l ive upgra de civi lization, and culture ri ch connotati on" of thought, caug ht built b eautiful vill age, and whole village a dvance, a nd easily relocation, and "five modified threebuilt", proje ct near 30 a; depth i nto col

35、 ogical, a nd i ndustry, a nd cult ure, and tourism, eleme nts, hig h standards ca ught party origi nal city liu, a nd ja de are xia ao, m odel vill age, in province city set has benchmark. f our is e qual be nefits to pr omote sharing, coordinate d devel opme nt of various social undertakings. in t

36、 he ca se of rigid spe ndi ng slowi ng revenue growth, increase, financial 75% to the people's livel ih ood, the masses have m ore access i n the shari ng. cuoban somethi ng good and benefit. a dhere to t he affordabl e, best , carefully cuoban v illage oil , water and heat, cultural, city and c

37、ounty colum ns pra ctical, developments benefit families, bring more w elfare to the masse s. devel opme nt of social conve nience. a cce ptance of bala nce d devel opme nt of com pulsory educati on through the national assessme nt, the county vocati ona l education ce nter was named "top s cho

38、ol of vocational educati on in chi na", the thir d batch of nati onal reform and devel opme nt model t hroug h pr ovincial .five is to deepe n reform and i nnovation to break bottlene cks a nd e ndogenous development of effective fire. as an engi ne of dy namism, adding reform key to adopting r

39、eform measures stress energy and bre ak bottle neck s and prom oting dev elopment. pay close attention to the key areasof reform. conscienti ously im plement the provi ncial depl oyment a nd cancel, adjustment, t o undertake the a dministrative a pproval items a ccordi ng to regulation 347 to fur he

40、r improve a dministrative efficie ncy conti nui ng de epe ning reform for pov erty alleviation, speedi ng up r ural land right registration certificati on pilot pr oject , encouragi ng the orderly transfer of land management, uti lize the la nd re sources, i n or der to pr omote scale manageme nt la

41、id the foundati on. a ctively cultivate t he market. firmly establish a market-orie nted, nurt uring family farms, industrial users, pr ofessi onal coopera tion orga nization new market manageme nt main body 456, effectively improve t he industr y, inte nsive a nd marketization of encouraging support socialcapital i nto the small micro-cre dit, ur ban development, cult ure and touri sm, public service s and other areas, easing dev elopm