Electronic devices usually require electricity to operate, and the process of charging capacitors into electrons is called charging. At this point, the two plates of the capacitor are always positively charged on one plate and the other is negatively charged on the other plate. Connect one plate of the capacitor to the positive pole of the power supply (such as the battery pack), and the other pole to the negative pole of the power supply. The two plates are respectively charged with the same amount of different charges. After charging, there is an electric field between the two plates of the capacitor, and the charging process stores the electric energy obtained from the power source in the capacitor.