Large-Capacitance Electrolytic capacitors which tend to have a short lifetime due to significant self-heating. The capacitor's ESR changes according to the frequency. With the capacitor ESR at a certain frequency set as "R" and the ripple current set as "I", "RI2" becomes the power heat loss and the capacitor self-heats. While large-capacitance is acquired using an electrolytic capacitor, significant heat develops due to ripple current and a high ESR, which is a weakness of electrolytic capacitors. The upper limit of the ripple current which the capacitor allows is called the "allowable ripple current". The life of the capacitor will decrease when the usage exceeds the allowable ripple current.