Chapter 22 Capacitance, Dielectrics, Electric Energy Storage C2兀E L In R2/RI 1>>RB Capacitance of unit length depends only on geometrical factors,in this case L, R, andR. I/* IRA R
Chapter 22 Capacitance, Dielectrics, Electric Energy Storage — depends only on geometrical factors, in this case L, R1 andR2. 2 1 0 ln 2 L R R C C o = = Capacitance of unit length RA RB l RB l + + + + - - - -
Chapter 22 Capacitance, Dielectrics, Electric Energy Storage 22-3. Capacitor in series and parallel 529-532 1. Capacitors in series(电容器的串联) features C C2 q1 1+ q2 1 q=q1=q2= q U7=U1+U2+…+U 由U= U 有 111 +∵+ CCC —+∴ C, CC
Chapter 22 Capacitance, Dielectrics, Electric Energy Storage 22-3. Capacitor in series and parallel 529-532 1. Capacitors in series (电容器的串联) features： q = q1 = q2 = = qn U =U1 +U2 ++Un C1 C2 Cn U1 U2 Un U q1 q2 qn 由 C q U = n n C q C q C q C q = + ++ 2 2 1 有 1 C C C Cn 1 1 1 1 1 2 = + ++
Chapter 22 Capacitance, Dielectrics, Electric Energy Storage discussion 1.电容越串容量越小。 The equivalent capacitance c is smaller than the smallest contributing capacitance. 若面积S相同,相当于将极板间距增大。 C=-0 2可提高电容耐压程度,外加电压由各电容器分压
Chapter 22 Capacitance, Dielectrics, Electric Energy Storage discussion 1.电容越串容量越小。 The equivalent capacitance C is smaller than the smallest contributing capacitance. 2.可提高电容耐压程度，外加电压由各电容器分压。 若面积S相同，相当于将极板间距增大。 d S C 0 =
Chapter 22 Capacitance, Dielectrics, Electric Energy Storage 2. Capacitors in parallel(电容器的并联) features q ∫U=U1=U2 q=q1+q2+…+qn 由q=CU7 CC=C11+C22+…+C C=C+C +∴+C 电容越并越大,若极板间距d相同,电容并联相当增加 面积S。 The net effect of connecting capacitors in parallel is thus to increase the capacitance
Chapter 22 Capacitance, Dielectrics, Electric Energy Storage 2. Capacitors in parallel (电容器的并联): features U =U1 =U2 = =Un q = q1 + q2 ++ qn C1 C2 Cn q1 q2 qn 由 q = CU CU = C1U1 +C2U2 ++CnUn C = C1 + C2 ++ Cn 电容越并越大，若极板间距d相同，电容并联相当增加 面积S 。The net effect of connecting capacitors in parallel is thus to increase the capacitance