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How does it's rotational resistance change? I thought it's basically an electric can motor being turned by the engine, so the resistance to passing the coils of wire through a magnetic field would be constant whether the there was demand for the electricity produced or not??


On any generator (or motor for that matter), as the load on the generator/alternator increases, the current in the windings increases. Therefore, it takes more force to produce the supplyfor that load. On an engine-driven generator, that means it takes more horsepower to turn the alternator.

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