如图，已知R1=R2=R3=R4=R5=R6=R7=10Ω求AB间的等效电阻Rab等于多少？
A与R1之间标X.R4
,
R5
之间标X.两点为同一点
B于
R7
之间标Y.R3,R4之间标Y.两点为同一点.
电阻两边经过X,Y点(正负极)的只有R1和R4
两电阻并联.R总=R1*R2/(R1+R2)=5欧
绛旓細鍥炶矾鎬荤數鍘婾=9+18-12-3=12V閫嗘椂閽堢數娴併侷=U/R鎬=12/40=0.3A銆俇 FA=E₃-E₄-RI=18-3-30脳0.3=6V锛屽嵆閫嗘椂閽6V U EB=E₂-R I=9-20脳0.3=3V銆
绛旓細1) 鐢靛帇琛ㄦ祴鐨勬槸R3鐨勭數鍘嬶紝鍥犱负R2=R3涓斾袱涓數闃讳覆鑱旓紝鎵浠2涓婄殑鐢靛帇涔熸槸2V銆傛墍浠=2V+2V=4 鐢佃矾鐨勭瓑鏁堢數闃=R1||(R2+R3)=2/3R=U/I=4/0.3 鎵浠=20娆у 2锛夊綋涓や釜琛ㄤ簰鎹㈡椂锛岀數璺敱浜庣數鍘嬭〃鍙樺緱涓嶈兘瀵奸氾紝鎵浠ョ數鍘嬭〃璇绘暟鏄數姹犵數鍔ㄥ娍4V锛岀數娴佽〃涓0 ...
绛旓細鐢靛帇琛ㄧず鏁颁负R3涓ょ鐨勭數鍘嬶紱鍥犱负涓変釜鐢甸樆闃诲肩浉绛 鎵浠ョ數婧愮數鍘嬬瓑浜嶳3涓ょ鐢靛帇鐨勪袱鍊嶅嵆涓4V锛岃屾荤數璺负0.3A锛屽彲浠ョ畻鍒扮數闃讳负20R锛涗袱琛ㄤ簰鎹㈢殑璇濈數璺腑鐢靛帇琛ㄥ氨鏄敤鏉ユ祴閲忕數婧愮數鍘嬩簡锛屽氨鏄鐢靛帇琛ㄥ唴闃婚潪甯稿ぇ鍩烘湰涓婂氨鏄柇璺紝鐢ㄥ垎鍘嬪畾鐞嗗氨鍙互鐭ラ亾鐢靛帇琛ㄧず鏁颁负4V锛屽洖璺腑鍩烘湰涓婃病鏈夌數娴佹墍浠ョ數娴佽〃绀烘暟...
绛旓細5/3,1骞跺緱锛(5/3)/(1+5/3)=5/8 5/8锛1涓插緱锛13/8 鎵浠AB=13/8娆
绛旓細鏈鐨勭瓑鏁堢數璺浘濡備笅锛氱敱鍥惧彲鐭ワ細R3锛R4涓茶仈锛屽垯R3 + R4 =2 娆у锛屽畠鍜孯5骞惰仈寰2/3娆у锛岀劧鍚庯紝杩欎釜鐢甸樆鍐嶅拰R2涓茶仈锛屽緱鍒扮殑鐢甸樆鏄5/3娆у锛 鏈鍚庯紝鐩稿綋浜5/3娆у鐨勭數闃诲拰R1骞惰仈銆傛墍浠ab=5/8娆у銆
绛旓細绛夋晥鐢佃矾鍙互鐪嬪嚭浠栦滑鐨勫叧绯讳负锛R1//[R2+(R3//R4)]R3//R4=2娆у R2+2=6娆у R1//6=3娆у銆傛墍浠ユ渶鍚庣瓑浜3娆у 锛2锛夛細鐣欒繃R1鐨勭數娴佷负2A 鍙緱Uab=2*4=8V 鐣欒繃R2鐨勭數娴佷负8/6=1.33333A 淇濈暀涓や綅灏忔暟寰1.33A
绛旓細1锛夊綋寮鍏硈鏂紑鏃 鐢甸樆R1鍜R2骞惰仈锛岀數闃籖3鍜孯4涓茶仈鍚庡啀涓嶳2骞惰仈锛屾墍浠34锛漅3+R4锛20锛堟濮嗭級R12锛漅1/2锛10/2锛5锛堟濮嗭級鍒欑瓑鏁堢數闃籖锛漅12*R34/锛圧12+R34锛夛紳20*5/锛20+5锛夛紳4锛堟濮嗭級锛2锛夊綋寮鍏硈闂悎鏃 鐢甸樆R1銆丷2鍜孯4骞惰仈锛岃孯3琚煭鎺 鎵浠ョ瓑鏁堢數闃籖锛漅1/3锛10/3锛3.3锛堟濮嗭級
绛旓細搴旇鏄1A銆傝繍鐢ㄦ埓缁村畞瀹氱悊锛岀敾绛夋晥鐢佃矾姹俁eq锛1惟锛屽洜涓R锛4惟鏃讹紝I锛2A锛孍锛滻脳锛圧+Req锛夛紝鍙緱E锛10V锛屽綋R锛9惟鏃讹紝I锛滶/(R+Req)=1A銆
绛旓細涓轰簡绠鍖栫數璺紝鍚х數鍘嬭〃鐪嬪仛鏂矾锛岀數娴佽〃鐪嬪仛鐭矾 鍒r2,r3,r4骞惰仈鍚庝笌r1,r涓茶仈锛岀數鍘嬭〃娴嬬殑鏄痳2,r3,r4骞惰仈鍚庝笌r1涓茶仈閮ㄥ垎鐨勭數鍘 鐢垫祦琛ㄦ槸r2,r3鐢垫祦涔嬪拰銆傜粨鏋滃凡缁忔湁澶х缁欏嚭浜...
绛旓細1銆丷1銆丷2涓茶仈鐨勬荤數闃绘槸 Ra=R1+R2=3+3=6娆с2銆丷a涓R3骞惰仈鐨勬荤數闃绘槸 Rb=Ra*R3 /(Ra+R3)=6*3 /(6+3)=2娆 銆3銆佸悓鐞,R4銆丷5涓茶仈鐨勬荤數闃绘槸6娆,瀹冨啀涓嶳6骞惰仈鐨勬荤數闃绘槸 Rc=2娆(杩囩▼涓庡墠浜屾鐩稿悓)銆4銆丷b涓嶳c涓茶仈鐨勬荤數闃绘槸 Rd=Rb+Rc=2+2=4娆 銆5銆丷8銆丷9骞惰仈鐨勬荤數闃绘槸 Re=...
