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College Physics (Urone)
Found in: Page 772

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Short Answer

Given a battery, an assortment of resistors, and a variety of voltage and current measuring devices, describe how you would determine the internal resistance of the battery.

Internal resistance is Rint=Rtot-Rext.

See the step by step solution

Step by Step Solution

Step 1: Definition of internal resistance

Internal resistance is referred to as the opposed flow of current by the cells itself resulting in the generation of heat.

Step 2:Calculating internal resistance

To determine the internal resistance of the battery, we need to have some information. The first would be raw voltage(Uraw ) with no current flowing through. Next, we need to attach to the circuit, between the poles, a resistor with known resistance Rext . Then we can calculate the expected current, which would happen if the source was perfect, with no internal resistance. After that, we can measure real current, Ireal , and calculate total resistance as:


Finally, internal resistance is calculated as:


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