Machines {alternator}|, opposite of generators, can create direct current.
generator {dynamo}|.
Metal rings {slip ring}| can have alternating conducting and insulating regions and transfer electricity to or from rotor in alternators and motors.
Moving-belt friction can create static electricity of more than one hundred thousand volts {van de Graaf generator}|.
7-Machine-Kinds-Electromechanical
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Date Modified: 2022.0225