If you're using sprockets count the teeth on both of them and divide the drive sprocket into the driven sproket.This will give you your ratios. It's just like using gears.
The bigger the drive sprocket the faster the driven sprocket will run providing you didn't change the size of the driven.
If it were me I would be using belts. If you have an 8 inch drive pulley driving a 4 inch pulley the 4 inch pulley will turn twice as fast. This is the easiest way to explain it but there are other calculations for figuring it. I just tried to put in the simpliest term.
If you use whole numbers such as a PTO speed of 400 you would need a ratio of 9 to 1. Generator would turn 9 rpms for every 1 rpm of the pto. You're talking some series size pullies for this.
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