explain how you will get constant dc voltage from unsteady dc voltage with circuit diagram.
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Sorry which class question is this
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Most consumer electronics regulate the AC mains to DC. Some have a big, black, hurky wall wart that is unsightly and nearly impossible to plug more than one into a power strip without taking up two or three slots each. Others have the conversion circuitry built inside. A large part of the weight of the device is actually the transformer itself, which is usually made of several steel plates sandwiched and then epoxied together, and two or more windings of coated copper wire. Each winding can be any where from a just a few to several thousand turns. The number of windings determines how much change in voltage you will get out. When a current is introduced through one winding (or coil), it creates a magnetic field, with poles forming along the winding axis. If another coil is placed nearby, along the same axis, the magnetic field will induce a current, and thus a voltage, in the second coil. Adding a magnetically permeable core between the two greatly enhances the effect, reducing loss. Since the two windings are both made using insulated wire, you can wrap one around the other, with both wrapped around the core. This is very efficient and space saving, especially since you can add several separate windings to get whatever voltages you want out. Computer power supplies do this. The only thing is that the output is always AC, since for the magnetic coupling to work, the magnetic field must change polarity. The only way to do that is by using AC current, which switches between positive and negative voltages at 50-60Hz. In order for electronic circuits to work, we must convert this stepped-down AC voltage to a flat, stable DC voltage.
