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Q & A: Kirchhoff's voltage law and energy

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Most recent answer: 11/25/2013
Q:
Why Kirchoff's voltage law is called Law of conservation of energy?
- Raghavendra (age 26)
Mandya Karnataka India
A:

The law, for other readers, is that the sum of the voltage changes around a circuit is zero. It applies when there is no changing magnetic field through the circuit. That means that there are no magnetic EMFs. The voltages are then just a measure of the potential energy that a charge would have at each position. Since on the way around the circuit you come back to the same position, the sum of all the changes must be zero.

Mike W.


(published on 11/25/2013)

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