电流分配与1拉③并联电阻的分流电导成正比1GCu/ R,1GGu/ Rieqeqeq11两电阻的并联：19RR1/R ·1/RR3i201/R + 1/R2R +R2R,11R21/ RR,i7福福Ry+R21/ R+1/R11酒?Ri1/R,2(i-i)R + R1/R + 1/R
③并联电阻的分流 电流分配与 电导成正比 eq eq / / G G u R u R i i k k k = = i G G i k k eq = R1 R2 i1 i2 两电阻的并联： i 1 2 1 2 1 2 1 2 1 1 1 1 eq R R R R R R R R R = = + + 1 2 1 1 2 1 2 1 1 1 R R i i i R R R R = = + + 2 1 2 1 1 2 1 2 1 ( ) 1 1 R R i i i i i R R R R = = = − + +
吉11113.电阻的串并联1，这种连电路中有电阻的串联，又有电阻的并联接方式称电阻的串并联，也叫混联。111111例求: Rab，Red1cOdoR= (5+5)/ 15+6 = 12252620aR=(15 + 5) //5 = 42cd5215Q111111-bo1111111
3.电阻的串并联 电路中有电阻的串联，又有电阻的并联，这种连 接方式称电阻的串并联,也叫混联。 i 1 = = 165 11 15A 例 求: Rab , Rcd Rab = (5+5)//15+ 6 =12Ω Rcd = (15 + 5)//5 = 4Ω
例计算图示电路中各支路的电压和电流1i15Q1262十1182165V154012214uz = 6i = 6×15 = 90V=165/11=15Ai, = 90/18 = 5Au, = 6i, = 6×10 = 60V1u4 = 3i, = 30Vi=15-5=10A=10-7.5=2.5A档=30/4=7.5A
i 2 = 90 18 = 5A i 3 =15 − 5 =10A u4 = 3i 3 = 30V i 4 = 30 4 = 7.5A i 5 =10 − 7.5 = 2.5A 例 计算图示电路中各支路的电压和电流 i 1 = = 165 11 15A u i 2 1 = = = 6 6 15 90V u i 3 3 = = = 6 6 10 60V
11吉1福1例 求: Rab11/booabooa112001000202100102600600120Q40260250080011111/1booaRbooa12001009200100Q花100Q60214402R,=70Qab
例 求: Rab Rab＝70