how to make a DC motor a generator

Описание: A small project with three DC motors.I have powered one of the three DC motors that is driving our other two motors and the motor that I have powered is helping to drive the other two motors with a pulley.As a result it appears that our DC motor is generating two currents and I have put a smaller type of pulley to give two DC motors so that its rpm is very high and generates more current.It turns out that the motor we're turning is running on five volts and the Geo motor we're turning is producing 15 volts.
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