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

0.888 ohm

Step-by-step 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=(V-E)/(I)=(18.4-12)/(7.2)=0.888\ ohm`

So the value of internal resistance of battery is 0.888 ohm