The potential difference between the two grounds in this circuit can be determined(adsbygoogle = window.adsbygoogle || []).push({});

with the equation

AB = X + Z

where z is the voltage source and x is the node at the top of the circuit, and AB

is the potential difference between the two grounds.

Could someone please explain to me why this is the case?

http://img31.imageshack.us/img31/1401/circuity.jpg [Broken]

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# Voltage across an open circuit

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