Answer
The energy transfer rate in battery 1 is $~~64~W$
Work Step by Step
In part (a), we found that $i_1 = 4.0~A$
We can find the energy transfer rate in battery 1:
$P = i_1~\mathscr{E}_1$
$P = (4.0~A)(16~V)$
$P = 64~W$
The energy transfer rate in battery 1 is $~~64~W$
