A current source with emf E and internal resistance r is closed to a rheostat. Express the current power N in the external circuit as a function of current I. Draw graphs of changes in current strength I, power voltage N and efficiency h when changing the rheostat resistance R. At what ratio of external and internal resistances is maximum power achieved in the external circuit? What is the efficiency of the installation h (Fig. a, b, c, d, e)?

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