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Many types of fixed capacitors are used in electronics as well as electrical circuits. They are designed to have fixed value of capacitance. These capacitors can be classified according to polarity. The polarized and non-polarized fixed capacitor can be further classified by dielectric material used. Usually, fixed capacitor are named as per dielectric material used in them.

Capacitor performs three tasks in dc circuits i.e. taking charge, holding charge and delivering charge at certain time. When capacitor is connected to dc voltage source, capacitor starts the process of acquiring a charge. This will built up voltage across capacitor. Once capacitor has acquire enough charge, current starts flowing and soon capacitor voltage reaches at value approximately equal to dc source voltage. When capacitor has almost full voltage across it, no more current flows though capacitor. This take some time. But there is an interesting fact. The capacitor will not acquire 100% charge at same instant when dc voltage is given to it. The capacitor gets first part of total charge quickly, second part slowly, third part more slowly and so on. Hence we can say that capacitor charges non-linearly.