Calculate Unknown Emf Value | Power Dissipation

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To calculate the unknown emf value in the given circuit, users should sum the power dissipations from point A to point B. For resistors, the power dissipation is calculated using the formula I^2*R, while for voltage sources, the formula is I*V. It's important to consider the sign of the voltage source, where a drop in the direction of current (I) is positive and a gain is negative. Proper application of these principles will lead to the correct determination of the unknown emf. Accurate calculations are crucial for understanding circuit behavior.
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What is the value of unknown emf in this pic please help me?[PLAIN]http://www.atiani.com/int.gif
 
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just sum up the power dissipations from a to b, for resistors use I^2*R, for voltage sources use I*V and pay attention to the sign of of the source (a drop in the direction of I is +V, gain -V).
 

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