Battery with e.d. E = 4 V and internal resistance r = 1 ohm, shown in Fig. 119, is part of an unknown circuit. A voltmeter is connected to the battery poles so that the positive terminal of the voltmeter is connected to the negative terminal of the battery. The voltmeter shows voltage V = 2 V. What amount of heat is released per unit time at the internal resistance of the battery?

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