What is the internal resistance of a cell if a current of 0.9 A flows through a 2 ohm resistor and a current of 0.3 A through a 7 ohm resistor?

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For a cell with an internal resistance of Rc, if it is connected to a resistor with resistance R, the current I that flows through R and the voltage of the cell V are related by:

V = (Rc + R)*I ... (1)

Now...

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