1. The problem statement, all variables and given/known data What can I purchase so that I have a constant voltage that is cheap for my electromagnet and you can adjust to how many volts I want? Batteries will run out of power and not give good results. Also is there another easy way to precisely meaure the strength of the electromagnet other than using paperclips? 2. Relevant equations none 3. The attempt at a solution I don't know.