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Current, Voltage, & Resistance

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Electric Charges
& Circuits




Some rights reserved by reutC
Remember:
Electric charges come in
two varieties.


           Negative
                &
           Positive
Opposite charges attract.

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Current, Voltage, & Resistance

  1. 1. Electric Charges & Circuits Some rights reserved by reutC
  2. 2. Remember: Electric charges come in two varieties. Negative & Positive
  3. 3. Opposite charges attract.
  4. 4. Like charges repel.
  5. 5. Like charges repel.
  6. 6. How do we describe electricity? Voltage The difference in electric potential between 2 points. or How much the electric charges want to move.
  7. 7. Some  rights  reserved  by  Elfo  Tógrafo   High Voltage
  8. 8. Some  rights  reserved  by  Elfo  Tógrafo   Low Voltage
  9. 9. Some  rights  reserved  by  Elfo  Tógrafo   Zero Voltage
  10. 10. How do we describe electricity? Voltage is measured in Volts (V). Some rights reserved by crows to burnaby
  11. 11. The symbol for Voltage is: V
  12. 12. How do we describe electricity? Current How much electricity is flowing
  13. 13. Some  rights  reserved  by  Elfo  Tógrafo   High Current
  14. 14. Some  rights  reserved  by  Elfo  Tógrafo   Low Current
  15. 15. The symbol for Current is: I
  16. 16. Current is measured in Ampères (Amps)
  17. 17. How do we describe electricity? Resistance How difficult it is for electricity to move through a material.
  18. 18. Low Resistance High Resistance Electric fence, via Wikimedia Commons: http://commons.wikimedia.org/wiki/File:XN_Electrical_insulation_Electric_fence_00.jpg
  19. 19. The symbol for Resistance is: R
  20. 20. Resistance is measured in Ohms (Ω)
  21. 21. Ohm’s Law V=IR Watch: http://www.youtube.com/watch?v=-mHLvtGjum4

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