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4. Insulation resistance: used to indicate the size of the leakage. Generally small-capacity capacitors have large insulation resistances of several hundred megaohms or several gigaohms. The electrolytic capacitor's insulation resistance is generally small. Relatively speaking, the larger the insulation resistance, the better, and the leakage current is also small.
5. Losses: The energy consumed by a capacitor to heat up in a unit of time under the influence of an electric field. These losses mainly come from dielectric loss and metal loss. It is usually expressed as a loss tangent.
6. Frequency characteristics: The electrical parameters of the capacitor vary with the frequency of the electric field. Capacitors operating at high frequencies have a corresponding decrease in capacitance as the dielectric constant is lower at high frequencies than at low frequencies. Loss also increases with frequency. In addition, in the high-frequency operation, the distribution parameters of the capacitor, such as the resistance of the pole piece, the resistance between the lead and the pole piece, the self inductance of the pole piece, the lead inductance, etc., will affect the performance of the capacitor. All of this makes the use of capacitors limited.
