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Electric Circuits

Electric Circuits. Circuit: A closed-loop path of conduction through which an electric current flows. circuit diagram. Scientists usually draw electric circuits using symbols. cell. lamp. switch. wires. How you should be thinking about electric circuits:.

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Electric Circuits

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  1. Electric Circuits

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

  3. circuit diagram Scientists usually draw electric circuits using symbols. cell lamp switch wires

  4. How you should be thinking about electric circuits: Resistance: when a material resists energy passing through it (rocks in the river) In a circuit, length, width and material the wire is made of effects the resistance

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

  6. Open Circuit: Duracell Duracell An incomplete path that will not permit an electric current to flow

  7. Duracell Duracell Closed circuit: A complete path for electric current

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

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

  10. There are two main types of circuits: Parallel Series and

  11. Duracell Duracell Series Circuits circuits with only one pathway through which electrons can flow.

  12. Parallel Circuits Duracell Duracell circuits with more than one pathway through which electrons can flow.

  13. Series and Parallel Circuits

  14. Comparison Only one path for current to flow Multiple paths for current to flow Total resistance increases Total resistance stays same • Holiday lights -Household Current

  15. 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!

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

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

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

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

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

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

  22. Series Duracell Duracell Open or closed circuit?

  23. Series Duracell Duracell Open or closed circuit?

  24. Series Duracell Duracell Open or closed circuit?

  25. Series Duracell Duracell Open or closed circuit?

  26. Parallel Duracell Duracell

  27. Parallel Duracell Duracell

  28. Parallel Duracell Duracell

  29. Parallel Duracell Duracell Two complete circuits 

  30. Toll Road—Circuit Analogy

  31. 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.

  32. Conductor: a material through which electrons can move easily Examples… brass aluminum copper graphite water

  33. Which of these items are conductors?

  34. Insulator: a substance through which electricity cannot flow readily Examples… wood plastic rubber sulfur glass

  35. Which of these items are insulators?

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