4.将两电容器串联、并联,分别充电到2u、L 比较等效电容的Q、W rE 2u =000单C1+Cn<C2 C并=C1+C2 C1C2 Q1=C1+C2"C1+C,“<Q2=(C1+C2川 W=CU2;1c2-(2/2 W 2 (C1+C2 2 2(C1+C2 2 (C1+C22>4C1C2w/W2=4C2,<1 (C1+C2) (下一页)比较等效电容的 Q 、 W 4. 将两电容器串联、并联，分别充电到 2u 、 u 2u C1 C2 u C1 C2 Q = CU2 2 1 W = CU C并 = C1 + C2 1 2 1 2 C C C C C + 串 = u Q2 = (C1 +C2 )u C C C C Q 1 2 1 2 1 + = u C C C C 1 2 1 2 + + < 2 2 1 2 2 1 W = (C + C )u 2 1 2 1 2 1 2 2 1 ( u ) (C C ) C C W + = 4 1 2 1 2 1 2 1 2  + = (C C ) C C W W 1 2 2 (C1 +C2 )  4C C < C1 C2 （下一页）