Battery with e. d s. E = 4 V and internal resistance r = 1 ohm, shown in Fig. 118, is part of an unknown chain. A voltmeter is connected to the battery poles such that the positive terminal of the voltmeter is connected to the positive terminal of the battery. The voltmeter shows voltage V = 6 V. Determine the amount of heat released per unit time at the internal resistance of the battery.

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