What is the reason that a generator takes more mechanical power to drive a heavy current load than a light current load?

Name: What is the reason that a generator takes more mechanical power to drive a heavy current load than a light current load?
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The Answer is The reason that a generator takes more mechanical power to drive a heavy current load than a light current load is that the larger the load current through the generator, the larger the counter torque produced.

What Is the Reason That a Generator Takes More Mechanical