The Challenge: Recharge a Battery
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How do we get this
direct current electricity back into the battery?
We need to generate
about 14v to charge the battery. If we produce much less we will never
charge it and, more importantly, if we generate a lower voltage than the
battery already has then electricity will begin to flow from the battery
back into the generator. This will cause the battery to go dead and could
cause a dangerous short circuit.
To avoid this, we
incorporated a second circuit from the generator. In old fashioned car
circuits this would be called a shunt
circuit. When the current flowing through the shunt circuit reaches
a certain level it creates a magnetic field that is strong enough to move
a piece of iron, in our case a nail. This can act as a switch connecting
the generator to the battery when the voltage is high enough. This is
a basic solenoid.
Dit it work?