Kirchhoff

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Kirchhoffs Current and Voltage Laws
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KCL (Kirchhoffs Current Law)
The sum of the currents entering a node equals
the sum of the currents exiting a node.
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Node
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Application of KCL
I1 2A
I3 5A
I2 3A
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Problem w/KCL
I1 ?
I3 250 mA
I2 150 mA
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KVL (Kirchhoffs Voltage Law)
The sum of the potential differences around a
closed loop equals zero.
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Closed Loop 1
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Closed Loop 2
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Closed Loop 3
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Closed Loop 4
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Not Closed 1
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Not Closed 2
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What KVL Really Means
Sum of the Voltage drops across resistors equals
the Supply Voltage in a Loop.
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KVL 1
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KVL 2