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Statement of a problem № 2845

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A direct-current generator has an emf of 120 V; that is, its terminal voltage is 120 V when no current is flowing from it. At an output of 20 A the terminal potential is 115 V. (a) What is the internal resistance r of the generator? (b) What will be the terminal voltage at an output of 40 A?

Solution:
A direct-current generator has an emf of 120 V; that is, its terminal voltage is

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