I decided to repost the question and state my problems as I believe I was getting too confusing in the other thread.
a)Suppose that a battery of EMF E and internal resistance r is being recharged: another EMF sends a current I through the battery in the reverse direction. At what rate is the electrical energy converted in chemical energy in the recharging batter?
b) what is the power supplied by the recharging circuit to the battery?
The Attempt at a Solution
So, bassically a EMF source is being recharged by another EMF source. However, it does not state whether the EMF source that is doing the charging has an internal resistance. Do we assume there is no internal resistance?
This is what my answer is:
P= EI - I^2r
However, if there is an internal resistance on the battery that is doing the charging, then would it not be:
P= EI - I^2r - I^2R
I also don't know how to go about solving b)