Characteristics of Capacitor parameters

Capacitance.

The capacitance of a capacitor is a parameter representing the capacity of the capacitor to store charges, which is numerically equal to the ratio of the charge quantity Q stored on the plate to the voltage U added on the plate.

Capacity frequency characteristic.

The dielectric constant of non-polar medium is almost independent of frequency, and the capacitance frequency characteristic of capacitor is good, but the dielectric constant of polar medium varies greatly with frequency, and the capacitance frequency characteristic of capacitor is poor.

Capacitor loss.

1. Definition: under the action of an electric field, the energy consumed per unit time due to heating is called the loss of the capacitor.

2.The ideal capacitor can store all the energy from the power supply in the capacitor; But the actual capacitor must consume certain energy in the circuit, namely: transforms part of electric energy stored in the capacitor into heat energy, this part of heat energy on the one hand causes the capacitor to heat up, the temperature rises; On the other hand, the surface of the capacitor sends out into the surrounding environment.