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- 1. Series andParallel Circuits
- 2. Circuit Defined A circuit is a path for electrons to flow through. The path is from a power source’s negative terminal, through the various components and on to the positive terminal Types Series Parallel 2
- 3. Components - SourceDRY CELL a source of electrical energy - + 3
- 4. Components - Load LIGHT BULB lights up when electricity pass through 4
- 5. Circuit - Complete Source of electrical energy AppliancesComplete circuit - + Electricity flows 5
- 6. Terms to Know Open circuit – there is a break somewhere and electricity cannot flow (maybe the switch is open) Closed circuit – electricity can flow (the switch is closed) Short circuit – the electricity completes a circuit without going through the load Load – what is using the electricity 6
- 7. SchematicsCircuit diagrams, also called schematic diagrams, provide a graphic representation of an electric circuit using standard symbols. 7
- 8. Diagram Symbols wire or conductor resistor or other load bulb V voltmeter battery A ammeter switch generator 8
- 9. Example – Simple Circuit - + circuit diagram A + - A 9
- 10. Complex Circuit - + A Construct the circuit diagram + - A 10
- 11. CircuitsCan either be seriesor parallel.
- 12. SeriesCurrent only takes one path for electronsCurrent flows through every part of the circuit
- 13. Lights in a Series
- 14. SeriesIfyou add a resistor (like another light): Total resistance goes UP since all the current has must go through each resistor.
- 15. Adding Resistors toSeries: Current in the circuit will go DOWN (lights will dim) If you remove a light bulb or one burns out —all go out!
- 16. Current in SeriesCurrent is the same at all pointsUse Ohm’s Law to find current using resistance and voltage
- 17. Voltage in SeriesVoltage isreduced by eachresistance –voltage drop
- 18. Resistance in SeriesAdd up all resistors toget total Totalresistance will go up because all of the current must go through each resistor.
- 19. Sample Problem #1 Draw a series circuit with two 1.5 V batteries, 3 resistors, and a current of 0.5 A.1. What is the total voltage of the circuit?2. What is the resistance of each resistor?
- 20. Parallel CircuitsHas at least one point where current dividesMore than one path for current to flowPaths are also known as branches
- 21. Lights in Parallel
- 22. Parallel:Ifyou add a resistor: Total resistance goes down Total current goes up when you add another path
- 23. Removing a LightBulbIf you remove a light bulb or one burns out, the others stay on because the circuit is still closed.
- 24. Current in ParallelCurrent flows into a branching point, the same total current must flow out againCurrent depends on resistance in each branch
- 25. Voltage in ParallelVoltageis thesame across eachbranch – becauseeach branch is onthe same wire
- 26. Resistance inParallelCalculate current in each branch based on resistance in each branch by using Ohm’s Law
- 27. Practice problem #2 Draw a parallel circuit with two resistors (one on each branch) and a 12 V battery.1. What is the voltage through each resistor?
- 28. Toll Road—CircuitAnalogy
- 29. Toll BoothExplanation Adding toll booths in series increases resistance and slows the current flow. Adding toll booths in parallel lowers resistance and increases the current flow.
- 30. Batteries in Seriesand Parallel:
- 31. In series—The voltage is increased.In parallel—No change in voltage; these batteries will last longer!
- 32. One More FINAL Thing:Two Types of Current:DC—Direct Current— produced by solar cells and chemical cells (batteries)Current only flows in one direction.
- 33. 2 type of current: ndAC—Alternating CurrentCurrent flows back and forth (alternates)Found in homesGenerators produce AC current

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