6-9volt generator
Small size
best for school project
Quick Power
 
Best Small Size 6-9volt Generator ALTERNATOR Dynamo motor. Very easily generate power. Even you can rotate it by hand it will generate power and can glow a led easily. suitable for wind energy in air turbine, water energy, hand crank energy etc. Dual shaft DC mini generator motor.
 
Generating voltage - 6-9v aprox depending upon speed
Generating current - 1.5A max
Generating power - 25 watts max
Shaft dia  - 2 mm
Motor length - 25mm
motor dia - 15mm
Capacitor inbuilt to rectify the output current.
RPM - 100-1500 rpm.
As fast you can rotate this it will generate more and more power.
use a pulley or gear system to increase the speed.