How do you convert a 3 volt fan to a be able to use on a 12 volt car battery?

Most cars run off a twelve volt battery. 12 VOLTS DOES NOT EXISTS ON CARS TRY 13.68 VOLTS. And any variation around that. That needs to be explained if someone try it to get 12v.

To step down 12 VAC to 3 VAC, you could use a step-down transformer with a winding ratio of 4:1 between primary and secondary. There are a number of ways one can step down 12 VDC to 3 VDC, but...

Thanks for your contribution and thoughts but you CAN use a 4.2 volt charger for a 3 volt battery. Jyot No. You should not use a 4.2V charger for a 3V battery. The charger is specifically designed...

first of all we will use inverter then connect with step up transformer.......pratik parmar....getco officer....mg....

Maybe - it depends on what device will be used. Many devices that run off a car battery will have some kind of voltage conversion and regulation so often times it will work just fine (at the expense...