Take a table - tennis ball and make thre...

Take a table - tennis ball and make three slits into it.
put semicircular fins cut out of a metal sheet into these slits.
Pivot the tennis ball on an axle through its centre with a straight metal wire fixed to a rigid support.
Now connect a cycle dynamo to this.
connect a bulb in series.
Direct a jet of water or steam produced in a pressure cooker at the fins.

What do you observe ?

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