平行板电容器是中学物理中的重要的电学元件,它内部的电场是匀强电场,它能储存电荷和电能,它能通交阻直等一些独特性能,使力学、电磁学等许多重要的知识点可以在电容器问题上进行结合;另外,电容器在实际生活中应用广泛,它能很好的考查学生解决实际问题的能力.因此,对电容问题系统的归类分析是有必要的. The parallel plate capacitor is an important electrical component in the middle school physics. Its internal electric field is a uniform electric field, it can store electric charge and electric energy, it can pass through some unique properties such as direct resistance, so that many important knowledge of mechanics, electromagnetics, etc. Points can be combined on the capacitor problem; in addition, capacitors are widely used in real life, it can well examine the ability of students to solve practical problems. Therefore, the classification analysis of capacitive problems is necessary.