how can i make an electrical device whos in put is 12v and output is 5v +ve
217147
Use potential divider
437409
You might start by contacting the power company.  If you have concerns about eletromagnetic interference, they should be willing to help you.
159512
Probably just connecting it through an input transformer with a 150 ohm input (mike) to at least 10K ohms ('puter) output would suffice.
57292
You need a circuit called an inverter.  These are available to plug into your 12 V socket in your car.  However, use these with the engine running or you could easily drain your battery.
615533
You can get an idea on counting the discs on the insulator string and multiplying by 12kV/disc.\nAgain it is only a general rule of thumb and is not accurate.\n\nSource 50 years as an Electrical Engineer
264715
Depending on ur circuit, the type of switch may vary. Here is the simplest one.\n\nTake two conducting blades. Separate them with some insulator, say paper, at one end so that there some destance, about 1 cm at the other end of blades. now solder the connecting wires to the two blades. When the upper blade is prseesd over the lower one, electrical contact is established between the blades and the circuit switches on\n\nblade 1           \n_______________________/wire 1\n========\ninsulator\n========\n_______________________/wire 2\nblade 2
431730
The voltage across each resistor will be 12 volts as each is effectively directly connected to the battery.\nIt is the current flow through the resistors which will be different.\nVolts/Ohms =Amps - that is\n12/7 amps or 12/5 amps now get your calculator out!\nRoyS
312193
To design a motor is not an easy task. The motor has poles and the winding is done in a particular fashion. As far as ur science project is concerned , go to a shop ask for 12V dc motor (one that is used in stereos etc.) and then do the operation at home. DOn know about site.
676101
Have you the original lead?...if so you'll be able to get the power rating etc and see if your local electrical retailer can help.
306020
Hi, Try this site http://www.uk-homeimprovement.com/articles/electrical/electrical.htm it has a table coloured red and green, red means you can not do it without notifying the building control department.
401885
I would recommend contacting an engineer to do this.  It would be worth the 300 bucks to know that you are doing it right.
398613
I don't think you can do that. you need the number of amps and the power factor for that device.
610964
There are some solution available at http://www.batteryspace.com/index.asp?PageAction=VIEWCATS&Category=885
547440
generally pc work on 18 volts dc not 12 . they actually us e less than 12 volts . but for prop sake and etc . if you can tell the kind of pc you us e i can give you a digram of what to do . dc to dc is not a solution for your problem
40774
You might ask another student or the teacher for help.\n\nThe specifics of making a convertor depend on exactly what she bought.\n\nLet's assume she bought 4 diodes and a capacitor.\n\nShe can use the diagram below to hook up her diodes (see link) and then simply add the capacitor across the output of the diodes, being sure to keep the plus and minus attached to the proper corner of the diode "square" arrangement.\n\nBest of Luck!
134313
u can go to library.alldata.com and be able to find the wiring schematic. or sometimes u can call a local parts store and they can print one out for you.
495159
It depends on whether you simply want a boost in voltage value or a boost in signal power. In order to simply boost the voltage you need a transformer but if you want the signal the be boosted in power also you what you need is a simple amplifier circuit.Amplifier chips are available in IC patches