How Do I Calculate Kirchoff's Law?

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    Kirchoff's Current Law

    • 1). Add the currents entering the node in question, including the unknown current.

    • 2). Add the currents exiting the node in question.

    • 3). The sums from Steps 1 and 2 should be equal.

    • 4). Use simple arithmetic to determine the unknown current's magnitude. If it is a positive number, then it is an entering current, as assumed. If it is a negative number, then it is actually an exiting current.

    Kirchoff's Voltage Law

    • 1). Add all voltages around the closed loop, including the unknown voltage.

    • 2). Set the sum from Step 1 equal to zero.

    • 3). Use simple arithmetic to determine the unknown voltage magnitude.

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