Question

V = I ( R + r ) r = ?

Answer 1

Answer:

r = $\frac{V-IR}{I}$

Step-by-step explanation:

Given

V = I (R + r) ← distribute parenthesis

V = IR + Ir ( subtract IR from both sides )

V - IR = Ir ( divide both sides by I )

$\frac{V-IR}{I}$ = r