ţٶõʵʷο෴ijΪֵ˵õʵʷοͬijøֵ˵ʵʷο෴ʵʷǰմ
ͳ涨Ŀ۴ڣοΪ·̶ġ 4ԭΪͼ1-5УԪ
ֱԴءеԪϵ͵ѹIJοѱڲοͨuõi12ai26ai34au180vu2120vu330vжЩԪ ǵԴЩǸأ 3 ͼ1-54·ͼ
֤p= p1+p3+ p4+ p5= 160+120+80+360=720wp= p2 =720w·еԴĹʵڸյܹʣϹƽ⡣
16ҳ
1ԪĴܹ̾ųܵḶ́
wl?li2/2֪䴢ܽȡͨԪĵ͵l˵ѹأԵԪ˵ѹΪʱܲһΪ㡣ԪĴܹ罨糡Ḷ́wc?cu2/2֪ԪĴֻȡڼڵԪ˵ĵѹ͵cͨݵĵأԵԪͨĵΪʱ䴢ܲһ㡣
3ul?ldiֱ֪·ͨԪеĵ㶨䣬˵Ԫdt
Ըеѹеѹڵ··ʱɴ˵óԪֱ൱ڶ·ic?cducֱ֪µԪ˵ѹ㶨˵dt
Ԫûгŵͨеѹڵ··ɴ˵óԪֱ൱ڿ·
4ѹԴΪ㣬ԴӸα仯ĵѹ͵ֺܱ㶨ԴԴDzܵЧġʵʵѹԴģͺ͵Դģ͵趼ֵӸصı仯ѹԴģĵѹ͵Դģĵ֮仯һ¿ԵЧ 21ҳ
1മʱЧǵֵ϶ʱЧԼֵĵ裬r?r2ಢʱЧСǵֵ϶ʱЧԼֵСĵ裬r?r1 2ͼa·abĵЧ裺r?2?(3//6?4)//6?5?
ͼbŵ·УԱ۵ij˻ȣһƽţƽʱ֧·ãabĵЧ裺r?(6?9)//(2?3)?3.75?
ͼc·abһ̽ߣЧ裺r?0? 3ػʵǣԴڸص裬rs?rl 4ಢЧr?30//20//60?10?r3·ʱIJЧ㡣
5۶ϵΪ5aı˿۶ʱ˿˵ĵѹܰ˿㣬Ϊ۶ѹֻǷӳ˿ʱֵ˿۶ʱĶ˵ѹӦϿʱϵ֮ĵѹ
6Ҫ12vֱԴʹ6v50maС⣬Ӧòͼ1-23a ʾ·ӡ
7׳Ƶĵ˿նϺٴϣ˿һضС˵ѹʱԷֻ˿ڳ¹ܿ첻յ
8¯¯˿ѣʽӺԿɶʱӦʹãʱ䲻ʽӴֻᱻٴնϣԭͬ7 23ҳ
1ѡcΪοʱضϿʱ·vb?vd?vc?0va?4vرպʱ·еvb?va?vc?0vd??4v
2·ijλڸõ㵽·ο·ԪϵѹĴֵͣϵij㵽οĵѹߵڵ·οԣ·ûο㣬λûġѹλ֮СȡλIJֵ·οأǾԵѹDzĸԭ·λܸߣĵѹþһܸߣΪλСΪʱ ĵѹͻС㡣
2sϿʱvb=1212+1226/(26+4+2)=7.5v
25ҳ
1ӶԵ·ķ㡣ˣֱκε·ֻҪԵģõӶзͼ㡣֮·ṹټֻҪǷԵģӶá
2͵ѹһκΪԹϵ˵Ӷͼ㣬ǶκԹϵ˲õӶзͼ㡣
3ӵӶѧϰУǶԵ·еԣԵ·УɶԴһ֧·͵·ѹԿǸԴʱ֧·ѹĵӡ
27ҳ
1ӵĵ·ɳΪ硣纬еԴʱԴ磬ѹԴģͺ͵ԴģͶԴ磻веԴʱΪԴ硣
2Ӧôά϶·ĹУάϵЧ·ĵѹԴĿ·ѹʱѹԴಢԪã͵ԴമԪҲãάϵЧ·裨Դ˵裩ԴԴʱԴеѹԴ·еԴ·
3Ӧôά϶ĿǼӵ·ķ㡣һӵ·ֻ
ijһ֧·ijѹʱӦôά϶ȻԵ·ķͼáӵ·ʱ֧·ѹά϶á
4һӵ·еĴ֧·ϿͻõһԴ硣ԴĿ·ѹuoc⣬uoc=usԴеѹԴΪ㣬еԴ·ɵõһԴ磬˵rabrab=r0
ά϶ʵʾǣһӵ·вҪоԴôάϵЧ·棬Ӷһӵ·вҪоԴ֣Դಿֵķ㡣
2½ں
34ҳ
1ֵƵʺͳΪҽҪءֵЧֵӳġСƵʣƵʻڣӳʱ仯Ŀ̶ȣȷʱʼλá
2Ƶʲ֮ͬλбȽϡλĸͬƵʵЧ
3ЧֵΪ180vֵԼ255vֵ˸õѹֵ220vԲЧֵΪ180vҽԴϡ
36ҳ
16?j8?10?53.1??6?j8?10?126.9? 6?j8?10?53.1??6?j8?10??12.69?
250?45??35.35?j35.3560??45??42.43?j42.43 ?30?180??30 3֪ͨĴʽΪʽĹУһҪעķڵޣܸļʽΪʽĹУͬҲעķ⣬ģֵǰӦΪţΪţӦڷϼӣ180o 44ҳ
1ݵҪʽdzŵ硣ݽֱ·ʱʱ̣ܶһʹԴϿ֧·Ҳٻеͨνġֱãݽڽ·ϣڽСʱ仯˵ݻϵسŵ磬ʼһĵͨݣνġͨá
2ֻҪڵԪ˵ĵѹЧֵ䣬ͨԪĵҲ㶨䡱
˵DzԵġΪҽ·еĵ֧·ic?uc?cСԴѹЧֵйأ·Ƶйأc
ֵһĵԪѹЧֵ䣬·Ƶʷ仯ʱͨԪĵҲƵʵı仯ı䡣
3ڴԪҽ·УʵĴСӳ˴ԪԴ֮ĹģֻĹУԪϲĵܡܼùǶΪںԪϡȽġйʣŰѴԪϵġֻġΪʡӳ˲ģΪ