Can we apply Kirchhoff's law in practical life? Kirchhoff's first law applies to currents at a junction in a circuit. It states that at a junction in an electrical circuit, the sum of currents flowing into the junction is equal to the sum of currents flowing out of the junction. Kirchhoff's second rule—the loop rule: The algebraic sum of changes in potential around any closed circuit path (loop) must be zero. Kirchhoff's Third Law, the most important one for our lesson on star spectra, tells us that a thin cool gas, in front of a source of a continuous spectrum, will form an absorption line spectrum. Kirchhoff's laws are used to help us understand how current and voltage work within a circuit. They can also be used to analyze complex circuits that can't be reduced to one equivalent resistance using what you already know about series and parallel resistors. The major drawback of Kirchhoff's law is that it assumes that the closed-loop has no magnetic field in it which is fluctuating.

Hima Xavier

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