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## Homework Statement

Calculate the value of the current through the 12V battery shown in figure (attached).

## Homework Equations

V = IR

I1 = I2 + I3

## The Attempt at a Solution

I've calculated the current for the left hand loop, see below:

Loop 1:

E_1- E_2- V_1- V_2=0

E_1- E_2= V_1+ V_2

E_1- E_2=I(R_1+ R_2)

13-12= I (3+1)

1=4I

1/4=I

I=0.25A

I understand it's a process of doing the same to the right hand side and then subtracting the two sides? I'm just unsure as to when i should be adding the voltages and resistors and when i should be subtracting them.Is it related to the direction of the current and voltage potential? If anyone can help here it would be greatly appreciated. Thanks.