Steps for Applying Kirchhoff Rules

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**Draw the circuit, label all the known and unknown quantities.**

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**Assign a***direction*to the currents in each part of the circuit :

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**If you guess the direction of the current incorrectly, your result will be***negative*. However, the*magnitude*will be the same.

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**You***must adhere*to the assigned direction.

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**Apply the***junction rule*to any junction in the circuit.

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**Apply the***second rule*to as many loops in the circuit as needed :

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**Choose a loop and a***starting point*( arbitrary ).

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**Choose a***direction*( clockwise or counter-clockwise ) and traverse the loop.

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**If a***resistor*is traversed*in the direction*of the current : the change in the potential is –*i*R .

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**If a***resistor*is traversed*opposite to the direction*of the current, the change in potential is +*i*R .

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**If an***emf*is traversed from the__+ to the –__terminal : the change in potential is –**e****.**

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**If an***emf*is traversed from the__– to the +__terminal : the change in potential is +**e****.**

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**Solve the equations simultaneously for the unknown quantities.**

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