Physics for IGCSE & O level - Magnets And Currents (Section 6 - No. 40)
If you want to increase the output voltage of a generator, what is one thing you could do?
Increase the speed of rotation.
Use a stronger magnet.
Use a weaker magnet.
Decrease the number of turns.
Forklaring
Stronger magnets, and a faster rotation result in more voltage.