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Chapter 21: Q15CQ (page 772)

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.

Short Answer

Expert verified

Internal resistance isRint=Rtot-Rext.

Step by step solution

01

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.

02

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 resistanceRext. 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:

Rtot=UrawIreal

Finally, internal resistance is calculated as:

Rint=Rtot-Rext

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