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A capacitor is a device tart is used for storing electric charges. They are used in the ignition system of automobile engines to eliminate sparking. They are used to reduce voltage fluctuations and to increase the efficiency of power transmission. They are used to generate electromagnetic oscillations.
a diode is a discrete component that enables the current to flow in one particular direction only.
they are used in half wave and full wave rectification. Zener diodes are used as regulators.