## DC Circuits

Kirchoff's RulesNot 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} At each junction, the sum of the currentsinmust equal the sum of the currentsout; this is justcharge conservation.

Around any circuit loop, applyenergy conservationin the form of

For our example,

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

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