KIRCHHOFF’S RULES. Junction rule. The sum of the magnitudes of the currents directed into a junction equals the sum of the magnitudes of the currents.

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Presentation transcript:

KIRCHHOFF’S RULES

Junction rule. The sum of the magnitudes of the currents directed into a junction equals the sum of the magnitudes of the currents directed out of a junction. Loop rule. Around any closed circuit loop, the sum of the potential drops equals the sum of the potential rises.

Using Kirchhoff’s Loop Rule Determine the current in the circuit.

Reasoning Strategy Applying Kirchhoff’s Rules 1.Draw the current in each branch of the circuit. Choose any direction. If your choice is incorrect, the value obtained for the current will turn out to be a negative number. 2.Mark each resistor with a + at one end and a – at the other end in a way that is consistent with your choice for current direction in step 1. Outside a battery, conventional current is always directed from a higher potential (the end marked +) to a lower potential (the end marked -). 3.Apply the junction rule and the loop rule to the circuit, obtaining in the process as many independent equations as there are unknown variables. 4. Solve these equations simultaneously for the unknown variables.