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# 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