What values does the current strength in a closed circuit depend on? The results of what experiments make it possible to answer this question?

The current strength depends on the internal resistance of the current source and is directly proportional to the EMF of the current source. The experiment with an electrolytic bath shows the dependence of the current strength on the internal resistance. The experience with the opposite inclusion of galvanic cells shows the dependence of the current strength on the EMF source.

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