Roland had known from his childhood experience back in the modern world, that DC generators were simple machines working on simple principles. He had disassembled a dozen of motors from his four-wheel-drive toy cars, including both ordinary whiteboard motors and legendarily high-performance Jinchaoba motors, and he had wound rotor copper wires by hand... All of them had been typical DC motors.
Based on his knowledge, DC motors had the same structure as DC generators, and they were basically the same thing. A DC motor, added a mechanism for driving its motor rotor, could double as a DC generator. The rotor, namely the conductor, constantly rotating inside a magnetic field and cutting the magnetic lines, would cause electric current to flow.
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