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Calculating Internal Resistance

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 Preview

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 ...

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.