How Do You Calculate the EMF of a Cell in a Circuit?

[oooouftt]

Finding the EMF of the cell...

first post =)

Homework Statement

Find the EMF of the cell.
(diagram has been uploaded)

Homework Equations

Resistors is series : Rs= R1 + R2 + R3
Resistors in parallel: 1/Rp = 1/R1 + 1/R2 + 1/r3
V=IR

The Attempt at a Solution

Firstly i re-drew the circuit in a more simple form, to see what resistors are in parralel and which ones are in series. I then found the total resistance in the parralel circuit part that contained the 0.2A current. after that i used : V=IR.
My answer still seems incorrect as i got total EMF = 4.8V

 

[Doc Al]

I then found the total resistance in the parralel circuit part that contained the 0.2A current. after that i used : V=IR.

That would tell you the voltage across that branch (and all parallel branches), but that's not the EMF of the battery.

Show exactly what you did, step by step.