并联的特点是，两个电容两端的电压都相等。即：U = U1 = U2因为：Q1 = C1×U1 = C1×UQ2 = C2×U2 = C1×UQ = Q1 + Q2 = C1×U + C2×U = (C1 + C2)×U = C×U所以：C = C1 + C2
