Saturday, 22 November 2014

electrostatics - Applying Kirchoff voltage law to a short circuit


If you consider an ideal wire with no resistance that shorts an ideal battery, the only voltage drop that exists is the emf of the battery, with nothing to balance it.



Obviously in the real world such a scenario is impossible, for the wire will have some resistance, but in this ideal example, is KVL not violated?



Answer



No, it doesn't break. All it means is that all the voltage is on the ideal wire. According to Ohm's law there will be infinite current to account for the zero resistance. That's what happens in a real circuit - if you short a battery the current is very high.


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