A storage battery with emf = 2.6 V loaded with an external resistance produces a current l

Question:

A storage battery with emf ε = 2.6 V loaded with an external resistance produces a current l = 1.0 A. In this case the potential difference between the terminals of the storage battery equals V = 2.0 V. Find the thermal power generated in the battery and the power developed in it by electric forces.