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Internal Resistance of a Battery

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The circuit is used to measure the internal impedance of a battery.
The battery being tested as a NiMH battery cell.
A fresh battery is being tested, and it is found that the voltage Vout,
is 2.28 V with the switch open and 2.27 V with the switch closed.
Find the internal resistance of the battery.

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This solution calculates the internal resistance of a battery.

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When the switch is open there is no current flowing and Vb = Vout (no voltage ...

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