Question

What is the internal resistance of an automobile battery that has an emf of 12.0 V and a terminal voltage of 18.4 V while a current of 7.20 A is charging it?

Answer 1

Answer:

0.888 ohm

Explanation:

We have given that the battery has an emf of 12 volt that E =12 volt

Terminal voltage V =18.4 volt

Current through the battery is =7.20 A

We have top find the internal resistance of the battery

Now according to Kirchhoff's law V=E+IR

So $R=\frac{V-E}{I}=\frac{18.4-12}{7.2}=0.888\ ohm$

So the value of internal resistance of battery is 0.888 ohm