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Kirchhoff's Laws
The algebraic sum of currents entering and leaving any point in a circuit must equal zero.
Stated another wayNo matter how many paths into and out of a single point all the current leaving that point must equal the current arriving at that point. |
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Kirchhoff's Voltage LawThe algebraic sum of the voltages around any closed path is zero.
Stated another wayThe voltage drops around any closed loop must equal the applied voltages.
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When voltages are opposing as seen at the right, the difference is the voltage applied to the circuit.
In this case 4 volts must be dropped by the resistors to equal the applied voltage.
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