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With a 1600 MΩ resistor across its terminals, the terminal voltage of a certain battery is...

With a 1600 MΩ resistor across its terminals, the terminal voltage of a certain battery is 2.59 V . With only a 5.09 Ω resistor across its terminals, the terminal voltage is 1.67 V .

1.) Find the internal emf of this battery. E = ________ V

2.) Find the internal resistance of this battery. r = _________Ω

3.) What would be the terminal voltage if the 5.09 Ω resistor were replaced by a 7.09 Ω resistor? V3 = _____________ V

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