《第十九章《家庭用电》知识点复习(一)》由会员分享，可在线阅读，更多相关《第十九章《家庭用电》知识点复习(一)（25页珍藏版）》请在金锄头文库上搜索。
1、Last week, our economic work Conference held today, held the Countys rural areas for work and five water treatment, three to split Conference, which this year was a matter of Thirteen-Five important meeting of our Countys economic and social development. The main task of the meeting was, on rural wo
2、rk and conscientiously implement the Central, provincial and municipal five water treatment, three to split series of important conferences, learn from the past, study deployment priority tasks this year. Just now, the XXX Deputy head and Deputy County magistrate, respectively, on the work of the XX
3、 was fully deployed, and put forward specific measures and requirements about is in place. County Environmental Protection Bureau, the XX town, town of XX 3 units for a position statement, resounding, demonstrated determination and confidence. Conference also recognition has advanced representative,
4、 this, I also representative County, and County Government, to by recognition of advanced said warm of congratulated! to rural, and water and three modified a split front General cadres workers extend sincere of greeting! following, I again told five points views: a, and deepening awareness, further
5、 enhanced work of sense and urgency since party of 18 session v plenary proposed has innovation, and coordination, and green, and open, and shared five big development concept Hou, rural and environment governance work can said was upgrade to has more high of strategy level, is Thirteen-Five build w
6、ell-off a top priority task. XX, County besides lingxi, Longgang, jinxiang, the Treasury, the hills, several industrial town outside the city centre, is basically belong to other rural areas, area, the vast rural population. Same time, the current and coming period, is the County into a crucial peri
7、od of the South Gate of XX beautiful, environmental regulation directly affects the effectiveness of the strategic objectives can not be achieved. Therefore, the focus on rural work and five water treatment, three to split, the XX economic and social development has an important role. Last year, thr
8、ough the joint efforts of the County, reform of the agricultural and rural development has made great progress in our County, environmental remediation and achieved initial results. Three agriculture agricultural modernization level continues to increase, new 4-level modern agriculture Park, release
9、d 20 agricultural leading enterprises above the county level, the County area of 200 acres of land more than eco-leisure, investments of more than 5 million Yuan reached more than more than 100 agricultural projects. Rural development has improved continuously, boutique line 1 completed the beautifu
10、l countryside, fine village 17, beautiful rural development conference was held in lingxi peach Lake in the city. Promote comprehensive rural reform, included in the provinces building three in one system of farmers cooperative economic organization first promoting the County. Improvement of farmers
11、第十九章家庭用电知识点复习 知识点精析1家庭电路组成由供电部分的线路(起电源作用的进户线)、用电器、开关、保险盒、电能表、灯座、插座、导线等组成灯座、插座并联在供电线路上，开关与灯座串联，电能表、保险盒应安装在家庭电路所有用电器前面的干路上，而且，保险盒应安装在电能表后面，且在干路上的火线上2保险丝家用保险丝是由电阻率较大而熔点较低的铅锑合金制成的，有过大电流通过时，保险丝产生较多的热量，使它的温度达到熔点，于是保险丝熔断，自动切断电路，起到保险作用不同保险丝有不同规格，要起到保险作用，必须选择规格合适的保险丝3插座通常插座有两个孔，一个孔接零线，一个孔接火线也有三孔插座，其中两个孔分别接火线
12、和零线，另外一个孔是与大地相连接的家用电器的三脚插头，两个脚接用电部分，另外那个与接地插孔相应的砷相接，是跟家用电器的外壳接通的，这样把三脚插头插在三孔插座里时，在把用电部分连入电路时，也把外壳与大地连接起来4家庭电路中电流过大的原因(1)短路：发生短路时，电路中电阻很小，根据欧姆定律 ，由于家庭电路电压一定，故电流强度很大(2)用电器总功率过大：根据P总UI总，由于电压U一定，当总功率过大时，电路中总电流必然过大5.家庭电路引起的触电(1)触电原因：家庭电路中有两根电线，一根是火线，一根是零线家庭电路触电事故，都是人体直接或间接与火线连通造成的(2)触电形式：单线触电：人站在地上，手触到了火
13、线或触到了与火线相连的物体双线触电：人两手分别接触火线、零线而触电6高压触电形式(1)高压电弧触电：人靠近高压线(高压带电体)，造成空气弧光放电而触电(雷击即是如此)(2)跨步电压触电：人走近高压线掉落处，前后两脚间电压超过了36伏而触电7安全用电原则不接触低压带电体，不靠近高压带电体8触电的急救(1)迅速切断电源(拉开总闸或总开关)(2)用干燥木棒、竹棒挑开电源线，迅速使触电人脱离电源。(3)发生电火灾时，务必先切断电源，再泼水救火(4)进行人工呼吸抢救9.特别警惕本来应该绝缘的物体导了电，本来是不该带电的物体带了电。 例题分析第一阶梯 例1如图10-1所示电路是家庭电路的一部分，现灯不亮，
14、用测电笔测 a、b、c、d四点，测b、c两点时氖管发光，测a、d两点时只有a点使氖管发光，则故障的原因是（ ） A、火线、零线相碰 B、灯泡断路 C、灯头内接线柱短路 D、c、d间断路 答案：某处能使氖管发光，该处的火线直接或间接相通，a点发光说明所在的线是火线，若火线零线相碰，d点也应发光，故排除A，若灯泡内断路、c点也不应发光，故排除B，若灯泡内接线柱短路d点应发光，只有c、d间断路，才出现c点发光d点不发光，故答案选D。 点拨：理解测电笔氖管发光的原因是解题的关键。 例2在家庭电路中，下列说法正确的是（ ） A、电能表是测量电功的仪表，要装在干路上 B、开关可接在火线上，也可接在零线上
15、C、保险丝是由电阻率大、熔点高的合金做成的 D、测电笔是测量电路中有无电流的仪器。 点拨：根据测电笔、电能表的作用、开关的连接要求、保险丝的材料特点解题。 答案：A 例3某同学家中原来电灯都正常发光，当把一个开关断开的台灯插头插入插座中，保险丝断，室内电灯全部熄灭，其原因可能是（ ） A、台灯的功率过大 B、台灯内灯泡短路 C、插座原已短路 D、台灯的插头短路 答案：保险丝断是因为电路中电流过大，台灯开关已断开，台灯未接入电路，台灯的功率的大小，灯泡是否短路，不是引起电流过大的原因，故排除A与B项，原来电灯正常发光，说明插座原来没有短路，故排除C项惟一可能的是插头短路，插入插座后引起家庭电路短路，故答案选D。 点拨：解答家庭电路故障题须依据现象分析判断，家庭电路故障常见的有断路和短路，后者一定会使保险丝熔断。第二阶梯 例4引起保险丝熔断的原因，以下哪种不可能（ ） A、电路中开关被短路 B、电路中用电器被短路 C、电路中用电器功率过大 D、保险丝的直径过小 点拨：引起电路中电流过大原因有：
