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# Calculating Internal Resistance

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Question: A 1.40 ohm resistor is connected across a 9.00-V battery. The voltage between the terminals of the battery is observed to be only 8.00 V. Find the internal resistance of the battery. Make sure the answer is in Ohms.

##### Solution Summary

This solution is comprised of a full explanation and the completed calculations required to understand and produce the correct answer, as it pertains to the 9.00 V battery in the following question. The solution is about 100 words in length and is quite descriptive for the question being asked.

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Real batteries have resistances inside them. We can model this simply as a battery providing an ideal electro-motive force (9.00 V in this case) in series with the internal resistance, Ri.

In this case, a load is connected to the ...

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