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Resistance: friction that impedes flow of current through the circuit (rocks in the river) How you should be thinking about electric circuits:

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Current: the actual “substance” that is flowing through the wires of the circuit (electrons!) How you should be thinking about electric circuits:

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circuit diagram cellswitchlampwires Scientists usually draw electric circuits using symbols.

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What is the difference between open and closed circuits?

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Circuit: A closed-loop path of conduction through which an electric current flows

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Open circuit: An incomplete path that will not permit an electric current to flow

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Closed circuit: A complete path for electric current

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Open circuit? Closed circuit? What kind of circuit is this?

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Open circuit? Closed circuit? What kind of circuit is this?

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How Do You Make Electricity Do What You Want?

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Insulator: a substance through which electricity cannot flow readily Examples… woodplasticrubber sulfur glass

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Conductor: a material through which electrons can move easily Examples… brassaluminumcopper graphite water

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Which of these items are conductors?

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Which of these items are insulators?

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What ’ s the Best Pathway for Electrons?

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There are two main types of circuits: ParallelSeries and

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Parallel circuits are circuits with more than one pathway through which electrons can flow. Series circuits are circuits with only one pathway through which electrons can flow.

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Series and Parallel Circuits

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Comparison Series CircuitParallel Circuit Definition Resistance Examples Only one path for current to flow Multiple paths for current to flow Total resistance increases Total resistance stays same -Holiday lights-Household Current

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Adding Resistors to Series: –Current in the circuit will go DOWN (lights will dim) –If you remove a light bulb or one burns out—all go out!

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Removing a Light Bulb: If you remove a light bulb or one burns out, the others stay on because the circuit is still closed.

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Flashlight What type of circuit is shown here? Parallel? Series?

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What type of circuit is shown here? Parallel? Series?

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Home lighting What type of circuit is shown here? Parallel? Series?

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Holiday lights What type of circuit is shown here? Parallel? Series?

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Car headlights What type of circuit is shown here? Parallel? Series?

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Series Duracell Open or closed circuit?

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Series Duracell Open or closed circuit?

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Series Duracell Open or closed circuit?

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Series Duracell Open or closed circuit?

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Series Duracell Open or closed circuit?

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Series Duracell Open or closed circuit?

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Parallel

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Duracell

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Parallel Duracell

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Parallel Duracell

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Parallel Duracell Two complete circuits

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Toll Road—Circuit Analogy

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Toll Booth Explanation Adding toll booths in series increases resistance and slows the current flow. Adding toll booths in parallel lowers resistance and increases the current flow.

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Series and Parallel Circuits. Objectives: ● To learn what an electrical circuit is ● To find out the differences between series circuits and parallel.

Series and Parallel Circuits. Objectives: ● To learn what an electrical circuit is ● To find out the differences between series circuits and parallel.

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