The sum of the emfs

The circuit below consists of three identical resistors each with resistance R=7 Ohm, two identical batteries with emfs E=9 V,
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The sum of the emfs and potential difference around a closed loop equals zero" is a consequence of:a) Newton's third law b)
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2. asked by susane
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For any circuit the number of independent equations containing emfs, resistances, and currents equals the number of branches.
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