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 Homework Statement
 Find r2 , v1 , v2 , v3 , It
 Homework Equations

It = i1 = i2 = i3
V1 + v2 + v3 = E
How i can find r2 value in this circuit?
R1 = 2
R3 = 5
E = 20v
R1 = 2
R3 = 5
E = 20v
Is there a way to actually solve it?It looks like you already know that the same current is flowing through all of those resistors since they are in a series; you also have your equation above. Great job! $$I = i_1 = i_2 = i_3$$.
You've gotten to the next step using KVL. Great job there too! $$v_1 + v_2 + v_3 = E$$.
Just like a regular mathematics problem where you want to isolate the variable of interest... I would solve for v_{2} and apply an equation that relates resistance (R_{2}) to voltage (v_{2}) and current (I).
Are you given the value of I? You would need either I or the value of R2 to solve for the voltages and currents, it would seem. Did you copy the question exactly?Is there a way to actually solve it?
Or can't solve because didn't have any i or p ?
Value of i not given...Are you given the value of I? You would need either I or the value of R2 to solve for the voltages and currents, it would seem. Did you copy the question exactly?