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# What is a capacitor bank?

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In electrical engineering industries, a capacitor bank is a group of several capacitors connected with one another. These capacitors must be identical and connected in either a parallel or series formation. Capacitor banks are used for different purposes, but usually to correct a fault within the system, such as lag or phase shifts. These banks can also be used simply to increase the energy storage of a system.

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Capacitors are electrical components that store energy. They have voltages proportional to the voltages running through them and display frequency-dependent behavior. Because of these qualities, capacitors can be used to correct a variety of different types of unwanted behaviors in electrical systems. When a capacitor bank is established, it usually takes advantage of these properties to modify the behavior of the system it is installed on. These banks are often the most cost-efficient ways of dealing with power shift and AC power supply problems. Capacitor banks, especially those designed to correct AC power problems, are useful for large industrial machinery and the circuits associated with them. However, large systems that face an energy deficit or a sub-par ripple current capacity can also use simple capacitor banks to remedy these problems as well.

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The different types of capacitor include ceramic, electrolytic , film, supercapacitors and glass capacitors. The main difference between the types is the material used to make the dielectric.

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A series combination of capacitors is reduced to a single capacitor by adding the sum of the inverses of each individual capacitor, then inverting that. The equation is C_eq = (1 / ((1 / C1) + (1 / C2) + (1 / C3) + ... + (1 / C4))). When capacitors are connected in a series, the total capacitance is decreased due to the equivalent capacitor having the total plate spacing of the individual capacitors.

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In finance, a lodgment is a deposit of funds into a bank account, according to Oxford Dictionaries. The term originated in the late 16th century and comes from the French word "logement," which derives from the Old French term "loge," meaning a dwelling.