polar capacitor

例句：

1. 1.The polar capacitor is used to store energy in a circuit.
   极性电容器用于电路中存储能量。
2. 2. In power electronics, polar capacitors are essential for smoothing the voltage waveform.
   在电力电子学中，极性电容器对于平滑电压波形至关重要。
3. 3. The polar capacitor was designed to reduce electromagnetic interference in the circuit.
   这个极性电容器的设计目的是为了减少电路中的电磁干扰。