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Electric circuits
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Electric circuits Presentation Transcript

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