Electric circuits

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Electric circuits

  1. 1. 35.1 & 35.2 – electric circuits<br /><ul><li>A closed loop of conductors creates a circuit
  2. 2. This provides a path for e to flow
  3. 3. Move from negative pole of battery to positive
  4. 4. As charges move through circuit, they lose energy (lose voltage – J/C)
  5. 5. Like water flowing through pipe
  6. 6. Charges are not allowed to bunch up
  7. 7. Devices can be </li></ul> connected in <br /> series or parallel<br />
  8. 8. 35.3 – series circuits<br /><ul><li>Devices are connected</li></ul> “end to end”<br /><ul><li>Charge must move through each, one at a time
  9. 9. Therefore, the current is the same through each
  10. 10. As charge leaves a voltage supply (or battery) it loses voltage (J/C) moving through each device – voltage drops
  11. 11. The sum of voltage drops = voltage supply
  12. 12. Any break in circuit, all movement of charges ceases
  13. 13. To find total current, equivalent resistance must be found – add the resistances of devices</li></li></ul><li>35.4 – Parallel circuits<br /><ul><li>Each device has its own </li></ul> path and can operate independent of the others<br /><ul><li>Voltage is the same across each device
  14. 14. Therefore, the current must be different
  15. 15. The current into a branch = current out of
  16. 16. The more devices, the more current paths, the larger the current that leaves the battery, the faster the battery is drained
  17. 17. Equivalent resistance < smallest resistor</li></li></ul><li>35.7 – parallel circuits & overloading<br /><ul><li>Household circuits are wired in
  18. 18. parallel
  19. 19. Additional paths lower the
  20. 20. combined resistance, ↑ current
  21. 21. Too much current causes wiring
  22. 22. to heat & melt insulation – overloading the circuit
  23. 23. Fuses or circuit breakers help prevent this
  24. 24. Fuse has wire ribbon that melts, must be replaced
  25. 25. Breakers use magnets or bimetallic strips, are reset
  26. 26. Touching wires because of worn insulation = short circuit</li>

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