How do you convert 230v ac to 3v dc?

Don't be lazy. Look in a college physics book.

A: Nobody should give you an answer for the simple fact there is no mention of current requirement. Let me try this minimum need is a reverse breakdown voltage of 648.60 volts. for 1 amp try 1n4007.

the work is done in the power supply box (the metal box part in the computer, the one you plug the power cord into). It converts AC to DC via transformers, rectifiers, and voltage regulators and has...

A: An easy way is to buy a transformer 230v to 50v and bridge rectify the output . There is power to be considered in any projects.

It is necessary to convert ac to dc so it can be stored and to drive electronic devices that cannot operate at high voltage.