Physics, 18.04.2021 22:50, amaya171

Plz help me with this one..I don't really know and I would be very greatful if I would get the help (in english)
the electrical circuit consists of a generator with a TEM of 15 V, the ammeter and a consumer of electricity with a resistance of 4000 m Ohm. The ammeter indicates the current intensity of 3 A. Determine the internal resistance of the generator.
(in romanian)
Circuitul electric este format dintr-un generator cu TEM de 15 V, ampermetru și un consumator de energie electrică cu o rezistență de 4000 m Ohmi. Amperimetrul indică intensitatea curentului de 3 A. Determinați rezistența internă a generatorului.

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Plz help me with this one..I don't really know and I would be very greatful if I would get the help...