Voltage regulators are a good idea when you need to obtain a large amount of electrical current; however using a potential divider isn't really a good idea most of the time. Sometimes this can cause overheating and even smoking which isn't really a good thing. Many people will use a regulator instead, finding that they are safer and more effective. There are even more effective ways to get the job done, if you know how – including a switching power supply.
The better method for you to use would be to try a switching power supply. The most common form of these are 12v Switching Power Supplies. The basic job of these is to take the voltage that is input and to switch it on and off very fast. Hence the name switching power supplies. Most people will try and find the 12v switching power supplies because they are a good use for most common needs.
When using 12v switching power supplies it's important to remember that they will use a lot less energy and a lot less power which will help to reduce the heat and therefore the smoke that sometime occurs with other methods. The 12v switching power supply draws less current then even regulators do therefore making in a much safer and easier option to use. So if you find that you are going to need to get large amounts of electrical currents this is the best option for you.
The problems that can come from using 12v switching power supplies usually have more to do with the cost than anything else. They can be a bit more expensive for you to be able to purchase to start with, however the peace of mind and the ability to not use as much current usually makes up for the cost right away.
The other problem is that because 12v switching power supplies run on such a complex set of circuits they are almost impossible for any normal person to fix. Should you find that it is not working right or it has a flaw then the chances are you won't be able to find anyone to be able to fix it. If you are able to find someone that will be able to fix it, then it's going to cost you, depending on the exact one you are using and what is wrong with it, then it may be more expensive to fix it than to just purchase another one. Your best bet is to try and make sure that you understand all the pricing before you make a decision either way.
Should you decide that you want to try and use a switching power supply then you will need to make sure that you research. They can range in volts and you need to make sure that you are purchasing the right one for your needs. 12v switching power supplies are the most common and the most used but that doesn't mean that you may not need something a little different. It is suggested to go to a store that sells them and try to explain what you need and how you will be using it.