Have a couple problems I'd like to ask to check...

Given the following, solve for E:

I=2.00 A,

R=28.0 V/A,

r=0.500 V/A

$\displaystyle I=\frac{E}{R+r}$

Work done.

$\displaystyle \frac{R+r}{1}\cdot I=\frac{E}{R+r}\cdot\frac{R+r}{1}$

$\displaystyle R+r\cdot I = E$

Answer: 28 V; believe I did something incorrectly.