6th Grade Ch 2 Sec 2 Electric Current

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6th Grade Ch 2 Sec 2 Electric Current

  1. 1. Ch. 2 Sec. 2 Electric Current
  2. 2. electric current <ul><li>continuous flow of electric charges thru. a material </li></ul><ul><li>unit=amp </li></ul>
  3. 4. Representing an Electric Current
  4. 5. electric circuit <ul><li>complete, unbroken path thru. which electric charges can flow </li></ul>Simple Circuits activity
  5. 7. electrical potential <ul><li>potential energy per unit of electrical charge </li></ul>
  6. 8. 2 factors that affect flow of current voltage (potential difference) resistance
  7. 9. conductor <ul><li>material through which a charge can flow easily </li></ul>
  8. 10. conductor <ul><li>material thru which electric currents move freely </li></ul><ul><li>electrons are only loosely bound to their atoms </li></ul><ul><li>eg. copper, silver </li></ul>
  9. 11. conductors <ul><li>silver </li></ul><ul><li>copper </li></ul><ul><li>gold </li></ul><ul><li>aluminum </li></ul><ul><li>iron </li></ul><ul><li>steel </li></ul><ul><li>brass </li></ul><ul><li>bronze </li></ul><ul><li>mercury </li></ul><ul><li>graphite </li></ul><ul><li>water </li></ul>
  10. 12. insulator <ul><li>material through which a charge can not flow easily </li></ul>
  11. 13. insulator = <ul><li>charges are not able to move freely </li></ul><ul><li>electrons are bound tightly to their atoms </li></ul><ul><li>eg. plastic, wood </li></ul>
  12. 14. insulators <ul><li>glass </li></ul><ul><li>rubber </li></ul><ul><li>plastic </li></ul><ul><li>asphalt </li></ul><ul><li>fiberglass </li></ul><ul><li>porcelain </li></ul><ul><li>ceramic </li></ul><ul><li>quartz </li></ul><ul><li>(dry) cotton </li></ul><ul><li>(dry) paper </li></ul><ul><li>(dry) wood </li></ul><ul><li>air </li></ul><ul><li>diamond </li></ul>
  13. 15. Conductors and Insulators [00:59] Conductors and Insulators Online Activity
  14. 16. Voltage (potential difference) <ul><li>Difference in electrical potential between 2 places </li></ul><ul><li>Causes current to flow thru. electric circuit </li></ul><ul><li>unit = volt </li></ul>
  15. 17. Voltage in a circuit is similar to the difference in potential energy on a roller coaster.
  16. 18. POTENTIAL DIFFERENCE Just as water flows downhill, electrons flow from places of higher potential to places of lower potential. The difference in electrical potential between two places is called potential difference.
  17. 19. WHAT IS VOLTAGE? Voltage is potential difference measured by a ______________ ? VOLTMETER The unit of measure in potential difference is called the volt. For that reason, potential difference may be called voltage.
  18. 20. ELECTRON FLOW Electrons will flow as long as there is a potential difference or voltage between two parts of a circuit.
  19. 21. WHAT CAUSES CURRENT TO FLOW? <ul><li>Voltage causes current to flow through an </li></ul><ul><li>electric circuit. The flow of electrons through a </li></ul><ul><li>material is called ___________? </li></ul>Electric Current
  20. 22. voltage source <ul><li>creates potential difference </li></ul><ul><li>eg. battery & generator </li></ul><ul><li>increase in voltage causes greater flow of electric current </li></ul>
  21. 23. voltage source <ul><li>has 2 terminals </li></ul>
  22. 24. resistance <ul><li>measure of how difficult it is for charges to flow thru. a material </li></ul><ul><li>unit = ohm </li></ul>
  23. 25. factors that determine resistance of a wire material from which wire is made length of wire diameter of wire temp. of wire
  24. 26. Charges flow through the wire, not the bird, because the wire offers less resistance.
  25. 27. Time to review
  26. 28. BBC - Schools Science Clips - Circuits and conductors BBC- Schools Science Clips-Changing Circuits http://www.learningcircuits.co.uk/
  27. 29. What happens when an electric current is produced? <ul><li>a continuous flow of charges travel through a material </li></ul>
  28. 30. Contrast electric current and static electricity. <ul><li>An electric current is a continuous flow of charge. In static electricity, charges build up but do not flow. </li></ul>
  29. 31. Explain why electric current cannot exist if an electric circuit is broken. <ul><li>charges cannot flow because the path is not complete </li></ul>
  30. 32. Define conductor and insulator. <ul><li>conductor = material is a material through which charges can flow through easily </li></ul><ul><li>insulator = material through which charges cannot flow through easily </li></ul>
  31. 33. List materials that make good conductors. List materials that make good conductors. <ul><li>good conductors = silver, copper, aluminum and iron </li></ul><ul><li>good insulators = rubber, sand, plastic and wood. </li></ul>
  32. 34. Create a concept map using the following terms: <ul><li>Electric current </li></ul><ul><li>Electric circuit </li></ul><ul><li>Conductor </li></ul><ul><li>Insulator </li></ul><ul><li>Voltage </li></ul><ul><li>Resistance </li></ul><ul><li>Ohms </li></ul><ul><li>Amperes </li></ul><ul><li>Volts </li></ul>
  33. 35. Electric current resistance voltage ohms volts amps

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