I'm trying to overclock my PC and I'd like to limit the current without losing voltage (small drop ok). I have a 12V/.3A water pump and an old 12V/1A nokia phone charger. 

Would something like this simple circuit work? [![enter image description here](https://i.stack.imgur.com/09T0k.png)](https://i.stack.imgur.com/09T0k.png)