Chapter 19, Problem 15Q

To determine

How can we measure the internal resistance of the battery?

Answer to Problem 15Q

Solution:

Internal resistance of the battery can be measured by connecting the battery to the known resistance.

Explanation of Solution

The internal resistance of the battery can be calculated by connecting the battery to the known resistance and then calculating the current across the resistance by the ohm’s law.

     $I=\frac{V}{R}$

The terminal voltage of the battery is also given as

     $V=E-IR$

Or the internal resistance is

     $R=\frac{E-V}{I}$