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Homework Help: Signs of electromotive forces

  1. Jan 2, 2017 #1
    Given this circuit, my textbook states that ℰ3 - ℰ1 = (R1+R2+R3+R4+2r) i.
    Should not it be ℰ1-ℰ3 on the left-hand side, since the current enters the negative and leaves the positive terminal of ℰ1 and does the opposite with ℰ3?

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  2. jcsd
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