What is the formula to solve for RPM to volatage output in a generator

[MoOp]

can anyone tell me how to solve for the voltage output in a generator and all the variables needed to solve it. What if I only have the RPM can I solve it?

thanks

Homework Statement

Homework Equations

The Attempt at a Solution

 

[Defennder]

Um, how is the generator set up? Is it an AC generator? And does RPM refer to round/minute?

 

[MoOp]

Um, how is the generator set up? Is it an AC generator? And does RPM refer to round/minute?

It is a DC generator but I would also like to know how to solve it in an AC generator. How can I calculate the voltage output in relation to Rounds Per Minute?