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Integrated Science Unit 3, Chapter 9 Unit Three: Electricity and Magnetism Chapter 9 Circuits 9.1 More Electric Circuits 9.2 Series Circuits 9.3 Parallel Circuits Chapter 9 Learning Goals Identify a series circuit. Identify a parallel circuit. Describe how our houses are wired. Build series and parallel circuits. Calculate total resistance in series circuits. Build circuits with fixed and variable resistors. Analyze series circuits using Ohm’s law. Use Kirchhoff’s voltage law to find the voltage drop across a circuit component. Compare current in series and parallel circuits. Compare voltage in series and parallel circuits. Use Kirchhoff’s current law to find an unknown current in a parallel circuit. Identify a short circuit. Explain why a short circuit is dangerous. Chapter 9 Vocabulary Terms Kirchhoff’s current law Kirchhoff’s voltage law parallel circuit series circuit short circuit 9.1 More Electric Circuits Key Question: What kinds of electric circuits can you build? *Read text section 9.1 AFTER Investigation 9.1 9.1 More Electric Circuits In SERIES circuits, current can only take one path. In PARALLEL circuits the current can take more than one path. 9.1 What happens if you plug in too many things? You can use more current than the wires can safely hold. If your circuit breaker "trips", this is a clue that you should unplug some appliances. 9.2 Series Circuits Key Question: How do you use Ohm's law in series circuits? *Read text section 9.2 AFTER Investigation 9.2 9.2 Kirchhoff's Voltage Law Around any closed circuit, all the voltage changes must add up to zero. 9.3 Parallel Circuits Key Question: How do parallel circuits work? *Read text section 9.3 AFTER Investigation 9.3 9.3 Kirchhoff's Current Law The same total current flowing into a branch point has to flow out again. 9.3 Open circuits and short circuits