pedal When the person she turns the wheel, which causes a magneto (called "Dynamo
bike"). The AC
thus produced is recovered: energy obtained is stored in capacitors. When the voltage across the terminals of capacitors
, representative the amount of energy stored by them, exceeds a threshold, then the energy contained in capacitors is sent to the excitation of the alternator
. The alternator can then begin producing himself the energy required for its excitation. The excitation power is about 25 watt
.