What is 12v: Definition and 156 Discussions

A V12 engine is a twelve-cylinder piston engine where two banks of six cylinders are arranged in a V configuration around a common crankshaft. V12 engines are more common than V10 engines. However, they are less common than V8 engines.
The first V12 engine was built in 1904 for use in racing boats. Due to the balanced nature of the engine and the smooth delivery of power, V12 engines were found in early luxury automobiles, boats, aircraft, and tanks. Aircraft V12 engines reached their apogee during World War II, following which they were mostly replaced by jet engines. In Formula One racing, V12 engines were common during the late 1960s and early 1990s.
Applications of V12 engines in the 21st century have been as marine engines, in railway locomotives, as large stationary power as well as in some European sports and luxury cars.

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  1. A

    Low RPM alternator to charge 12V battery

    Hi guys, I am working on a school project. I have an inclined cart mounted on rails moved by a winch. I would like to install an alternator on one of the cart axis, so I can charge a 12V car battery - 20Ah. The wheel turns at 12 RPM. At that speed the alternator will not work, so I am also...
  2. H

    How to get constant 12V from this step up converter

    Homework Statement I am working on solar charge controller for 12V battery..From solar panel 8 to 16V variable input goes to step up converter which will double available input voltage and then there would be some circuit which will make output of converter circuit constant at...
  3. marellasunny

    Can I use a ordinary 1K ohm potentiometer to convert 12V to 5V?

    I have a 1K ohm potentiometer.(datasheet is attached below). My aim is to convert 12V to 5V,which I would then apply to power the Arduino microcontroller. I'm not quite sure if I CAN use the potentiometer I have ie T93 YA 1K 1035 to do this conversion. The datasheet says that the maximum...
  4. J

    Connecting 12V Solar Panel to 12V Battery: Should I?

    I'm working on a project where I charge a 12 volt battery with a 12 volt solar panel. Links for the battery and solar panels are below. My question is how I should connect the two. The main thing I can find is that I don't want the solar panel draining the battery. I plan to put a diode from the...
  5. D

    Value of current through 12V battery

    Homework Statement a) Calculate the value of the 12V battery b) Calculate the power dissipated in R_1,R_2 and R. https://www.physicsforums.com/attachment.php?attachmentid=60819&stc=1&d=1376202905 Homework Equations I_1+I_2+I_R=0 The Attempt at a Solution For the left-hand...
  6. D

    12V battery to create spark gap?

    Hey okay, so I have a 12V source which can provide a max of 10 mA, and I also have a switch that can go from open to close in 1 ms, How can I create an inductive circuit that will create a spark gap between electrodes that are 3mm apart? I did the math and found the breakdown voltage to be...
  7. M

    Is a 12V car battery more powerful than a 12V power adapter?

    I'm confused about the relationship between the voltages of different power sources. Since a car battery is more powerful than an adapter and both are known to have output of 12 Volts, what can be said about how much power is consumed by the devices running on 12V? Will the same amount of...
  8. M

    Low cost buck regulator - 12v in - 5v@2A & 6.5V@1A out

    Hi all! I am looking for a low cost power regulation solution. Simply put, I need to be able to give a system 12v and get outputs of 5V@2A and 6.5V@1A. I was thinking of using two of these with the output in parallel: http://australia.rs-online.com/web/p/switching-regulators/6727124/...
  9. E

    Convert 24V to 12V for Scooter Horn Wiring

    I recently found a 24v scooter on Craigslist. I would look forward to wiring a horn to it. I don't know what kind of resistor I should use.
  10. J

    Create DIY 12v Electric Bicycle Motor

    I am making my own 12v electric bicycle but have read that a starter motor is not acceptable because it is not designed for extended use. What motor could I use?
  11. P

    Can you stable out a 12v dc pulse?

    Hey guys. I made myself a pulse circuit but my power supply failed. Now I need a way to use a 12v magneto as a power supply. But a magneto puts out pulses. Can I put a capacitor or a diode there to make it a steady stream of dc current? This is for my go kart 5hp briggs. for turn signal...
  12. E

    12V / 6A Power supply. Help with Buck and Boost converters + OR'ing circuit

    Hello all. Maybe someone here can give me suggestion of ICs and make considerations about this design. The attached picture states how this power supply should work. Details: 1) IC 1 probably will be a LT3650-8.4 from Linear Technology. It supports up to 32V of input voltage (40V peak)...
  13. K

    12V Lead Acid Battery Charging & discharging rate?

    Hi, I have simple question: In small OFF GRID wind turbine systems, it is worth to continuously charge & discharge 12V Lead Acid Batteries? this means that we want that our loads (lights, Fans e.t.c) are 24hours taking power from wind turbine & batteries will continuously charge &...
  14. M

    How Long Can a 12V Battery Power a 220W Appliance Using a 300W Inverter?

    Hello, I have a question, I've googled to find the answer but I didn't find any. I have 12v 100amp battery, 12v-220v 300watt inverter and 220w 220v appliance. I want to run the 220w appliance on the 12v battery by using the inverter. My Question is: How long will it last until the...
  15. reddvoid

    Can I Charge a 12V 15Ah Battery with 60V 4A?

    Can i charge 12V 15Ah sealed lead acid battery by giving 60V 4A to it's terminals ?
  16. S

    LED Torch Heads for 12V Miniature Railway Signals

    Hi, newby here, hope I can get some help on this question. I have a project that requires me to use a standard 9 LED torch head, normally running on 4.5 volts (three AA batteries) My project needs me to use 12 volt batteries to supply a control box and finally the 'torch heads' a distance away...
  17. R

    Conversion of 24V airhorn to 12V

    Would anyone know how to install a 24V airhorn I found at a garage sale in my truck? Obviously I only have a standard 12V battery as a power source... Thx in advance, and easy on the mockery, I am not a mechanic or an electrician by any means...
  18. H

    Searching for a 12v electronic switch

    New to the site, looking for a little help. I'm trying to switch my motorcycle auxillary lights on and off using the flash to pass switch. I have a relay but only stays on when powered. Is there a switch I can put inline, or a switching relay that will work. Thank you
  19. P

    12v dc small motor, speed control,

    Hi anyone I have 7 small 12v dc motors RF-500 TB, max efficiency 0.08 amp max speed 2180 rpm. These motors are just holding plastic reflectors of an american police car's roof barlight, they are individually fitted in separate pods with their own 50 watt bulbs. I need 5 pods to spin slower...
  20. R

    I need a 12v switch to respond to a 433.92 Mhz signal

    Im not an elctrical engineer but I do need a source for the above mentioned switch. I would even be open to a simple schematic. Please Help.
  21. G

    Building a 12v heater for my car

    I am trying to upgrade my antique car while still keeping the factory look The rear defroster is a blower motor that sucks in cabin air and blows it onto the back window. The air in the cabin has to get warm before the windows will defog. I am thinking of helping that a little by...
  22. V

    Why Does My 12V LED Light Strobe When Connected to a 24V Source?

    I have a ceiling fan that has a 24v output. It came with a led circuit board to light, however the light is very dim. I purchased a 12v led circuit board to increase the lighting. Now I know that the light is 24v and the new led board is 12v but it was a direct plug in so I thought I would try...
  23. N

    Producing 2000V at Low Amps with 12V Power Source

    What would be the best way to produce 2,000 volts at a low amperage using 12V as the power source? I guess I just want to produce 2000 volts at a low amperage in a mobile environment?
  24. W

    Can I run a 12v alternator with a 12v motor?

    The situation is this, I would like to power a Delco 1 wire 100 amp alternator with a 3/4HP 12v DC motor, I would have an automobile battery to start the motor, and for the alternator to maintain, plus I would like to have enough power to run an additional 30 amps (max) of accessories. I can...
  25. M

    12v dc motor speed self limited?

    Fellow Engineering Lovers, Being a mechanical with limited electrical I must turn to the electron masters for answers. I have a PM brushed DC 12 V fan motor on of a standard electric cooling fan on a car radiator. My calculation comes out to be about 90 watt. I also have PWM 12-24 power...
  26. 9

    12V Car Battery Amps: How Much Current Generated?

    hey guys can anyone pls say how much current in amps does a ordinary car battery of 12v generates?? pls...
  27. J

    Need help with simple 12v fan cooling system

    Alright so I have been bored this summer so decided to take apart my electronics such as my Xbox and AV receiver. I installed a nice 12vdc computer fan on the side of my Xbox so I moved onto my AV receiver and then ran into some problems. My current set up consists of: 2x - 12vdc computer...
  28. J

    Is there a chip with multiple N & P Fets for fast 5V to 12V conversion?

    Hi, new to these forums and glad I found them! I am working on a project that requires conversion of fairly hi-speed signals (10us pulses) from 5V to 12V. The usual open collector with a pull up is much too slow getting from 0 to 12V. I really need the ramp to happen between .05us to 1us...
  29. U

    How to run 12v lights through 110v wired house?

    Hello! I have waaaay to much time on my hands due to an illness and bought a bunch of items on ebay to play with and keep my time occupied. I bought a bunch of 12v smd led car bulbs and want to power them through my existing 110v wiring, I can handle fitting the bulbs into the existing...
  30. J

    Using vehicle 12v to power several 5v devices

    I need to power three 5 volt devices off a vehicle 12 volt axillary power. Each device draws 1.5A, 500 mA, and 750 mA. Would the vehicle 12 volt axillary power provide enough current for this? If so, what parts and configuration would I need to accomplish this? Thanks
  31. M

    How Can I Convert Multiple 5-6V 0.35-0.8A Power Sources to 10-15V 10A?

    heya i don't know if this is the right area for this question, but i am going to ask anyway, i want to turn upto 4 power sources which is 5 - 6V 0.35 - 0.8A into 10 - 15V 10A this is a link of the item/s i want to use to power it, and a link of the item i want to power...
  32. X

    5000 watt 120V generator to charge 10 12V Automotive batteries

    5000 watt 3600 rpm 120V generator to charge 10 12V Automotive batteries. Will this work? Less or more batteries? Im wanting to put together an electric car. If i use the items above (which is what I have laying around) What size motor would best for longevity, speed ? HP? RPM? AMPs?
  33. L

    DC to DC circuit for automotive relay - 5v to 12v

    Greetings E.E. Gurus! I'm a noobie in need of your guidance! Here's the situation: I have a 5V DC, 0.25 amp (1.25W ?) power source from an oil pressure switch wire on an old truck that is activated only when the engine is running. My goal is to activate a 12V DC, 2.5 amp, 30/40W...
  34. T

    Amp hours pulled from a 12V battery?

    Hi friends, I am having a little difficulty understanding how amp hours being pulled from a battery are calculated, any help would be much appreciated! I have a 12v 125Ah deep cycle battery. Research has told me that for DC appliances you divide their wattage by 12V to give the amps, so...
  35. J

    How to reverse the action of a small 12V DC MOtor

    Hey Guys ! I am working on a personal project, and I was hoping you could give me some help and advices. I am looking for a tool/device that would reverse the action of a small 12V DC motor (make it operate clockwise and then counter-clockwise for example). And I was also wondering what kind...
  36. R

    How to maintain a 12V 150 RPM geared DC motor's torque in all speeds?

    Hi everybody, This is my first message here and it looks like an awesome forum! :smile: I have a 12V geared DC motor and i am having a hard time figuring out how to maintain it's torque in from speed 0 to 150 RPM.. I know about PWM and figured it's not going to do it.. I am looking...
  37. J

    Powersing Two 12V Motors: A Complete Guide

    Hi, new to the whole electrical side of things, have never been good with voltages, currents or resistance etc. So I apologise for any simple questions. So if I have two 12v motors, does this mean I have to include two 12v (or one 24v) supplies? Or somehow does a 12v supply power both of them...
  38. B

    18V Batt. to 5V USB Port and 12V CIgarette Lighter

    i am beginner in electrical engineering and am doing it has more of a hobby, therefore i have no books to study from. but i am trying to power a 5 Volt USB Hub and a 12 Volt Cigarette Lighter from a car, with an 18 Volt Battery. Can anyone show me an example of how to set this circuit up...
  39. T

    Capacitor/Transformer Voltage Rating for a 12V Power Supply?

    Hello, About me...so you know where I am coming from. If you don't want to read, skip to the end-ish... I'd like to start off my saying that I know next to nothing about electronics although I am eagerly reading the All New Electronics Self-Teaching Guide right now and it is confusing but...
  40. J

    Resistor to trick 12v transformer

    Hi guys, new here. I was wondering if anyone knew of a way to trick a 12 volt transformer into seeing more load. I have these lights http://www.lowes.com/pd_172832-24969-800CBL5N_0_?productId=1207073&Ntt=tiella&Ntk=i_products&pl=1&currentURL=/pl__0__s?newSearch=true$Ntt=tiella$y=0$x=0" and it...
  41. C

    Charging 12V Batteries: Solar Panel and Electric Motor Q&A

    Hi, I have some questions please... Can I use a 9 watt solar panel to charge a 12v battery directly? Do I need a rectifier or is the loss back into the solar panel too small to worry about? Also, can I use a 24v electric motor (permanent magnet generator) to charge a 12v battery - or is...
  42. P

    Creating a Nichrome Heating Coil for 12V, 36W @373K

    Homework Statement A heating coil is to be made, from nichrome wire, which will operate on a 12 V supply and will have a power of 36 W when immersed in water at 373 K. The wire available has a cross-sectional area of 0.10 mm². What length of wire will be required? (Resistivity of nichrome at...
  43. A

    A typical 12v batter can deliver about 7.5 x 10^5 C

    PROBLEM: A typical 12v battery can deliver about 7.5 x 10^5 C of charge before dying. This is not very much. To get a feel for this calculate the maximum number of kilograms of water (100 degrees celsius) that could be boiled into steam (100degrees celsius) using energy from this battery. I...
  44. S

    How can I build a battery box with a switch to toggle between 12v and 24v?

    I have built these before, but have forgotten how I did it. I am making a battery box with four 12v batteries (7.5 Ah each). I will have only one pair of output terminals, one + and one -. Inside will be a switch to toggle between 12 and 24v. I do remember that in the 12v position all batteries...
  45. M

    Can a 9V Garage Door Remote Be Safely Powered by a 12V Motorcycle Circuit?

    Hi guys. I have researched this topic A LOT. In fact, I found these forums as a result. Evidently, it has been asked here before (Google knows all!). Mine has a slight twist to it. All the research I have done so far has been about people wanting to run a continuous 9v load off a 12v source...
  46. S

    PSU / Combine 12v and -12v rails for 24v?

    I would like to increase my voltage on these PSU's to 24v. If I combine the -12v and +12v for 24v do I still get the high current of the 12v side? +12v 70A -12v .8A 24v... but what is the current potential?
  47. B

    How Can You Add a Time Delay to a 12V Buzzer Circuit?

    Hello, I'm looking for some help with a (hopefully) simple EE question regarding a DC circuit. I'm a chemical engineer and it's been a while since elec/mag physics for me :-) Here goes: In my life outside engineering, I run a small ambulance service. Our ambulance has a rather annoying...
  48. P

    Calculating Relay Resistance for 12V Circuit

    Homework Statement A relay switches on when the current through the coil reaches 0.0048A. In a circuit, a battery of 12V is connected in series with this relay it switches on when another resistor of 800 Ohm is connected to it. Calculate the resistance of the relay. Homework...
  49. D

    In the Middle of Nowhere: Choosing Between Two Wires & a 12V Battery

    I am lost in the middle of a vast desert in my swim shorts. There is nothing anywhere around me as far as you can see. In front of me is a 12volt battery (say lead acid) with no markings or other indicators of polarity. there are 2 wires long enough to make a connection to the emergency...
  50. B

    Primary voltage is 220v and my secondary voltage is 12v

    how can I get the number of turns on my primary and the secondary transformer..if my primary voltage is 220v and my secondary voltage is 12v..
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