Kirchoff's Rules Not all circuits can be reduced to sets of series and parallel resistors. (Notice that the three circuit diagrams above all describe the

samecircuit).How can we handle a circuit like this which is more complex than being a combination of series and parallel pieces?

Assign a current

Ithrough each resistor._{n}Kirchoff's

JunctionRule:At each junction, the sum of the currents inmust equal the sum of the currentsout; this is justcharge conservation.Kirchoff's

LoopRule:Around any circuit loop, apply energy conservation in the form of For our example,

Watch the signs!With both of Kirchoff's Rules, there will be enough information,

Return to Ch 19, DC Circuits(c) Doug Davis, 2002; all rights reserved