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1、第3章 正弦稳态电路的分析习题解答3.1 已知正弦电压，当时，。求出有效值、频率、周期和初相，并画波形图。解 有效值为 ；将 , 代入，有 ，求得初相。波形图如下3.2 正弦电流的波形如图3.1所示，写出瞬时值表达式。图3.1 习题3.2波形图解从波形见，电流的最大值是，设的瞬时值表达式为当 时，所以 ，求得 或 。当 时，所以 ，求得 。所以 。3.3正弦电流，。求相位差，说明超前滞后关系。解若令参考正弦量初相位为零，则的初相位，而初相位，其相位差 ， 所以滞后于 角，或超前 角。3.4正弦电流和电压分别为（1）（2）（3）(4) 写出有效值相量，画出相量图。解 (1) ，相量图如图（1）(
2、2) 有效值相量为，相量图如图（2）(3) 有效值相量为 ，相量图如图（3）(4) 有效值相量为 ，相量图如图（4）3.5 图3.2中，已知，求。图3.2 习题3.5图解 列方程，有 相量关系为 ： 所以 。3.6 图3.3中，已知，求。图3.3 习题3.6图解 列方程，有 相量关系为 ：所以 。3.7 图3.4（a）中，求电压。 （a）时域电路 （b）相量电路图3.4 习题3.7图解 ，由于与是非关联方向，故由图3.4（b）得 所以 3.8 某线圈电阻可以忽略，其电感为，接于电压为的工频交流电源上时，求电路中电流的有效值；若电源频率改为Hz，重新求电流的有效值，并写出电流的瞬时表达式。解 当
3、HZ时， 当HZ时， 3.9 求图3.5中电流表和电压表的读数。图3.5 习题3.9电路图解 (a) (b) (c) (d) 3.10 求图3.6所示电路ab端的等效阻抗及导纳。图3.6 习题3.10电路图解 (a) (b) 3.11 在图3.7所示电路中，已知，求电阻及电容。图3.7 习题3.11电路图解 ， ，3.12 一电感线圈接在的直流电源上时，其电流为，如果接在、Hz的正弦交流电源时，其电流为，求线圈的电阻和电感。解 3.13 已知，试求图3.8中的电压。(a) 电路 (b) 相量模型图3.8 习题3.13电路图解 将时域模型转化为相量模型如图（b）所示。利用分压公式得3.14 求图
4、3.9所示电路的各支路电流。图3.9 习题3.14电路图解 输入阻抗 由分流公式得 3.15 已知图3.10中的，求图3.10 习题3.15电路图解 3.16 已知图3.11中的，求及，并画相量图。 图3.11 习题3.16电路图习题3.16相量图解 ， ， 3.17 利用支路电流法求图3.12中各支路电流。图3.12 习题3.17电路图解 列、方程为整理得3.18 利用支路电流法求图3.13所示电路的电流。 图3.13 习题3.18电路图解 列、方程为整理得 3.19 用节点法求图3.14中的电压。图3.14 习题3.19电路图解节点a： 节点b： 整理得：求得 则 3.20 用节点法求图3
5、.15中的电压。图3.15 习题3.20电路图解整理得： 求得 3.21已知，用叠加原理求图3.16中的电流。(a) 电路 (b) 相量模型图3.16 习题3.21电路图解 将时域模型转化为相量模型如图(b)当电流源单独工作时，利用分流公式得当电流源单独工作时，利用分流公式得3.22 用叠加原理计算图3.17中的电压。图3.17 习题3.22电路图解 电流源单独作用时电压源单独作用时 3.23 已知，试用戴维南定理求图3.18中的电流。 （a）电路(b) 相量模型图3.18 习题3.23电路图解 将时域模型转化为相量模型如图（b）所示，将与串联支路断开，求断开后的开路电压及 则 3.24 求图
6、3.19的戴维南和诺顿等效电路。图3.19 习题3.24电路图解 （1）开路电压的计算等效电阻的计算短路电流计算其戴维南等效电路和诺顿等效电路如图a和b所示（a） 戴维南等效电路 （b） 诺顿等效电路3.25在图3.20所示电路中，已知，求、及电压源提供的有功功率。 （a）电路(b) 相量模型图3.20 习题3.25电路图解 将时域模型转化为相量模型如图（b）用有效值相量计算， 3.26 日光灯可以等效为一个串联电路，已知日光灯的额定电压为。灯管电压为。若镇流器上的功率损耗可以略去，试计算电路的电流及功率因数。解 3.27 求图3.21所示电路中网络N的阻抗、有功功率、无功功率、功率因数和视在
7、功率。图3.21 习题3.27电路图解 网络N吸收的有功功率 无功功率 功率因数 （滞后）视在功率 3.28 某一供电站的电源设备容量是，它为一组电机和一组的白炽灯供电，已知电机的总功率为，功率因数为，试问：白炽灯可接多少只？电路的功率因数为多少？解 电机的视在功率： 白炽灯消耗总功率： 白炽灯可接的灯数为：(盏) 3.29图3.22所示电路中，已知正弦电压为，其功率因数，额定功率。求：（1）并联电容前通过负载的电流及负载阻抗；（2）为了提高功率因数，在感性负载上并联电容，如虚线所示，欲把功率因数提高到应并联多大电容及并上电容后线路上的电流。图3.22 习题3.29电路图解（1）由于 所以，.
8、（2）并联电容后， 3.30图3.23是RLC串联电路，。求谐振频率、品质因数、谐振时的电流和电阻两端、电感及电容两端的电压。图3.23 习题3.30电路图解 谐振频率 品质因数 谐振电流 电阻两端的电压 电感及电容两端的电压 3.31 在并联谐振电路中，已知，谐振频率。求值。解 3.32 图3.24所示电路已工作在谐振状态，已知，(1) 求电路的固有谐振角频率，(2) 求。图3.24 习题3.32电路图解 故 3.33 图3.25所示谐振电路中，,电流表读数是，电压表读数是，求的参数。图3.25 习题3.33电路图解 ， 由于 ，所以 。又因为所以 。3.34图3.26所示的正弦电流的频率是
9、时，电压表和电流表的读数分别是和；当频率是时，读数为和。求和。图3.26 习题3.34电路图解 由于 当时，得 当时，得解得。3.35 图3.27所示对称电路，已知，求每相负载的相电流及线电流。图3.27 习题3.35电路图解 电源正序且，则线电压为。A相负载的相电流 B相负载的相电流 C相负载的相电流 A相的线电流 B相的线电流 C相的线电流 3.36 在图3.28所示对称三相电路中，已知电源正相序且，每相阻抗。求各相电流值。图3. 28 习题3.36电路图解 由于电源对称且正相序，由此可得A相电压为 3.37 在图3.29所示对称三相电路中，已知， ，求电流表的读数。图3. 29 习题3.
10、37电路图解 三角形连接负载的相电流为表读数为线电流，由线电流与相电流关系可得：星形连接时，A相电压为：负载的相电流为表读数为相电流，即（英文版 ） easily blame, to prevent the broken window effect. Supervise the leading cadres to play an exemplary role, take the lead in the strict implementation of the and , lead to safeguard the solemnity and authority of the party dis
11、cipline, ensure that the party discipline and the laws and regulations for implementation in place. Throughout the discipline in the daily supervision and management, strengthen supervision and inspection, from the thorough investigation of violations of discipline behavior. Strengthen to key areas,
12、 key departments and key projects as well as the masses reflect the concentration of the units and departments for supervision. - strengthening supervision, discipline inspection and supervision of cadres to set an example for compliance with the and is a man must be hexyl, blacksmith needs its own
13、hardware. Discipline inspection organs as the executor of the party discipline, and supervisor of the defenders, for its supervision must be more strictly, discipline inspection and supervision of cadres to firmly establish the awareness of Party Constitution, sense of discipline and rules conscious
14、ness, politics loyalty, sense obey. Action speak Ji Ordinance to set an example of the regulations of the rule of law, strengthen supervision and accept the supervision of the firmness and consciousness, do comply with and . To firmly establish the discipline must first be disciplined, the superviso
15、r will be subject to the supervision of concept, and consciously safeguard and implement party compasses party, take the lead in practicing three strict real strict, so loyal, clean, play. To be good at learning, the Constitution and the as morality, politics and brought to fruition; to implement ,
16、do not want to, dare not, not with disciplinary ruler to supervision; to discipline a ruler, often the control inspection, and consciously in the ideological red line to draw the row Ming Good accumulation is indeed the bottom line, so that the heart has fear, said to have quit, the line has ended.
17、Attached: indifferent to heart, calmly to the table in our life, there are many unpredictable things will happen, some good, some bad things, we cannot control is powerless to stop, but with time, you will find in life sometimes turns out to be not good, some bad things finally turned out to be a go
18、od thing, but then we muddy however did not know, this is the life teach us things. 1, life can be complex, can also be simple. Want simple life of precipitation, to have enough time to reflect, to make Become more perfect. Life is the most important thing is not to win, but the struggle; not to hav
19、e conquered, but to have fought well. 2, the plain is the background of life. Live a plain life, give up on themselves is not a coward, but the wise answers; not disillusioned after the heart, such as ashes, but experience the storm after the enlightenment; not unrewarding perfunctorily, but calm at
20、titude of life of unrestrained self-confidence. Plain living, there is no noise noisy, no earthly troubles, more did not fill in the discontent of desire, some just a calm, a calm. 3, memory of heart will not good things to erase the, life is a When no movie, pain is a beginning, the struggle is a k
21、ind of process, death is a kind of ending. Give up this giving up is the helpless, do not give up the abandoned, do not give up this giving up is ignorance, do not give up should not give up is persistent. 4, a thing figured is heaven, think impassability is hell. Since the living, to live better. S
22、ometimes we because of too narrow-minded, too care around the chores and penny wise and pound foolish, not worth the candle. Some things to attract trouble and worry, completely depends on how we look at and deal with it. Dont always take everything back to things, and dont get into a blind alley, d
23、ont want to face, dont be narrow-minded. Poke to care, is a kind of open-minded, a free and easy. 5, I am not afraid of others behind me a knife, I afraid to look back and see stab me, is my intention to treat people; I am not afraid of the truth to tell the best friend, Im afraid he turned to it as
24、 a joke to tell dont 6, when we are in a positive frame of mind, you will find many good things; and when we are in a negative state of mind, you will find many depressed things; life happy and worry, all is you of life attitude, optimistic, good luck; loss of sink, Eritrea company. When you are in
25、adversity, may wish to change a point of view to think everything over to the good Think, because good mentality decided the fate of the! 7, people are tired, rest; heart tired, calm. Grow up, mature, this society read. Tired and sad, squat down, to their a hug. Because the world no one can sympathi
26、ze with you, have mercy on you. You cry, tears is your own; you pain, no one can understand. Then you only tears to smile. 8, each people have youth,Each youth are a story, the life of the world never gets easier, I want what, wish the world all know, as has been the same; now want anything, for fea
27、r that others know, or like to lose the same. 9, the heart move, everything in the world is followed by birth, Rangrang, important thing is often the most difficult to open ones mouth, because words will reduce its importance; to let strangers people care about your life in the good things, the orig
28、inal is not easy 10, do not blame, do not laugh at who, also dont envy who. Like a person is a kind of feeling, not like a person is true. The truth is easy to explain, I feel Is unspeakable. The best travel life is that you in a strange place found a long lost touched. 11, happy life not in the bus
29、tling in, and in the peace of mind; no matter how many grievances, how uncomfortable, and ultimately to heal themselves or their own, others may got you to comfort, but never know your heart is how wanjianchuanxin. 12, maam, like a movie, learn to appreciate, learn to be grateful, learn tolerance, a
30、nd goodness, helping others. Instead of accusing the society, as into one; and an exception is better to give than to what 13, dont envy him A sum of, dont lose your life and the life, respectively is: the former is a we experienced cannot escape in a day finally will last minute, while the latter i
31、s our persistent, we want to cherish the memory of those people and things. 14, learn to smile, learn to strong, the world you know so many people, so many people and you are, you cannot change also cant let everyone like you, so also do not want to do. Life is too short to go crazy to love to go to
32、 waste, to chase the dream to regret. 15, when temper, a blessing to go. A wounding elegant people, the key is to control their own emotions. With the mouth is the most stupid behavior. A control negative emotions than a can take a city more powerful water flow slow, language is expensive. People sp
33、ent two years of time to learn to speak, but to spend a few years time to shut up. That is a kind of ability, that is a kind of wisdom. 16, life is not perfect, sometimes, growth is not a cry, not an eyeful of tears, there is no trace of emotion, there is no gleam of hope, no desire, no action, no s
34、tatic, there is only one kind of downward sinking feeling, sink A murky? 6? 7? 6? 7 sink? 6? 7? 6? 7 toward the bottom of the sink. 17, in some way, do not go, you will not know the other side scenery is beautiful. To you is not good, you do not mind too much, no one has an obligation to you; you le
35、arn knowledge, is you have weapons, you can start from scratch, but not unarmed; how do you treat people, does not represent how others treat you, if cannot see through this point, only inviting worry. 18, time is like a sponge in the water, as long as you are willing to squeeze, the total water is
36、still there. Every life, after the ups and downs The best test of live, to life, survival and continuation, do not stop the struggle in the joys and sorrows of life on the road, so that different soul to bear life beat, acceptance of suffering. 19, indifferent to heart, calmly in table, elegant and
37、comfortable life, do not take what is so important. The pursuit will be disappointed; to be alive, you will have trouble. Life is the most afraid of what all want to care about, but also what all grasp is not firm, without scenery, separated populations, such as not to desire, all docked in the fate
38、 of the end. Why is too rigid, the natural, to go stay not to live, let go of obsession, revel is 20, if the fate of the broken Hopes of sailing, please dont despair, the coast is still, if the fate of the withered petals of the beautiful, please do not sink, the spring is still, life will always be
39、 endless trouble, please dont helpless, because they are still alive, is still a dream, the sun still, we still. Lost, keep memories; to get, must work to; but the most important is good to cherish their own. 21, life, select the complex, is to choose the pain; choose a simple, is choose to be happy
40、. The complex world like aSignificance of pride. Hope is the ornate palace, outside people admiring the magnificent, living in the deep knowledge of living it to pay the price. Simple world as a simple log cabin outside ridiculed shabby, the heart is willing to go live to know the joy. Suffering and
41、 joy is their own choice. 22, learn how to use a single powerful heart, let the past be the past, let the future come. Life is really the end of the end of an eagle is flying wings, life is constantly pursuit. Dont miss to regret, dont wait for old just miss. Time to return, seize every moment, agai
42、n painstakingly again tired also Those struggling to fly. 23, life could not Yimapingchuan, even flat pavement, inevitably there will be a few pieces of roadblocks. Some of the rocks around the past, while others have to move it out. Just move others put the stone is very easy, because the stone fro
43、m the appearance we can discern; difficult to myself to move away the heart of stone head. Leave time to spend with her, often reflect my heart, so as to remove your heart of stone. 24, everything does not have to be demanding, come to, everything does not have to care about, over the past; failing
44、to do not frown, laugh it laugh. Results Dont demand, do to; life is a simple, calm and peaceful. Always not to choose their own path and regret, life is like a train, the scenery and then the United States will retreat, the passage of time and encounter will eventually drifting further and further
45、away, before is always himself. 25, everyone has a weakness, weakness is true humanity. That has no weakness, a shallow person. That people think there is no weakness, mostly false. Life has shortcomings, there are shortcomings is the real life. That no one regret, or childish or numbness or Self deception. It is in tolerance of weakness and so on to accept, people live happily.Hello, everyone! I am a party member. The title of my speech is: study