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The capacitor consists of two conducting areas, the plate (electrodes), and an insulating layer between them, the dielectric. It is a task to store charges, i.e. electric energy. The ratio between the charge Q and the applied voltage V is a constant for every capacitor which depends on its structure. It is called the capacitance C. The dielectric has particular influence on a capacitor capacitance. As the relative permittivity (dielectric constant) epsilonr of the insulating material being used in creases, a greater charge can be stored when charging at the same voltage. However, a greater charge implies greater capacitance. Materials and design vary depending on the proposed usage, so a distinction must be made between capacitors whose capacitance can be adjusted within certain limits and capacitors whose capacitance is fixed. In order to make a choice, the technical data as well as the design are of significance, e.g. rated capacitance or rated power, nominal voltage, operating voltage, admissible temperature range. The type of connection must be considered. By connecting several capacitors in parallel, the capacitance or power can be increased. If the operating voltage is higher than the capacitor nominal voltage, capacitors can be connected in series. Capacitors which are to be connected to three-phase current are usually operated in delta connection and those to be connected to high voltage are operated in star connection.