The device is called a commutator, on the subsequent generator is still available.Why can maintain current commutator direction?This is because the current from the coil into commutator and the commutator is rotating with the magnet.Turn half circle, when the magnet coil in the direction of current inverse, commutator is also better for half a week and turn the direction, and the output current direction is always the same.Gerard pique and invention of the generator is the first in the world, of course, also has its disadvantages.
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