Answers

2015-10-14T20:40:15+05:30

This Is a Certified Answer

×
Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Let the EMF be  E and  Resistance be  R...

When the battery is discharging, then the current is coming out of the  positive terminal.  then the potential across the battery terminals will be:
     V =  E  -  I  R
       9 = E - 3 R        --- (1)

when the battery is charging, then the current goes inside the positive terminal. then :          V = E + I R
                   12 = E + 2 R    --- (2)

   solving them,  5 R = 3    =>  R = 0.6 ohms.

   E = 10.8 Volts or  54/5  Volts.



1 5 1