| The previous page described
how an ac generator operates.
A dc generator has a commutator and brushes which rectify the ac current leaving the generator, this action produces a pulsing direct current at the output terminals of the generator. Current flowing from the generator creates a magnetic field surrounding the inductor as it is creating the current flow. This magnetic field acts in the opposite direction opposing the movement of the conductor by creating a braking action. The generator requires a lot of power to overcome this braking effect when it is producing current flow. The driving power required by the generator increases directly in proportion to the increase in power being created. (Lenzie’s Law) |
 Fig 10d |
Fig 10e |