Electric current
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1) Electric current is the flow of electric charge through a conductor. Only electrons flow, and they flow from areas of higher electric potential to lower potential. 2) Voltage sources like batteries and generators maintain a potential difference that causes electric charge to flow through a circuit as electric current. Higher voltage results in higher current. 3) Resistance in a conductor opposes the flow of electric current. Higher resistance results in lower current for a given voltage. Ohm's law states that current is directly proportional to voltage and inversely proportional to resistance.
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Case Suomen Lähikauppa - Trainers House Change management success stories
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Electric current
- 1. Chapter 34 – electric current
- 3. Charge flows until no difference in potential
- 4. To sustain flow of charge, something must keep one end at a higher potential
- 5. Compare this to water flowing from a reservoir
- 8. Variable: I, I = q/t
- 9. SI unit: ampere (A), the “amp”, 1 A = 1 C / sec
- 10. The same number of e enter conductor as leave
- 12. causes a potential difference
- 13. Must have capacity to maintain
- 14. constant flow
- 15. Batteries chemical reaction
- 16. Generators convert mech. work to electrical energy
- 17. The voltage (potent. diff) is what forces charges to move – “electric pressure”
- 18. 120 V give 120 J to each coulomb of charge
- 20. Voltage & resistance (R) – the tendency to slow movement of charges
- 21. We can ↑ current by either:
- 22. ↑ voltage (electric pressure) or
- 23. ↓ resistance (or both)
- 24. Resistance of conductor depends:
- 25. Conductivity (how well it conducts)
- 26. Thickness – thicker = < resistance
- 27. Length – shorter = < resistance
- 29. High temp superconductor > 100 K
- 30. Ohm’s “law” states: current is directly related to voltage and resistance I = V/R
- 31. 2 x V = 2 x I, 2 x R = I/2
- 32. Therefore: small R = large current
- 34. Depends upon voltage & body resistance
- 35. Rwith salt water ~ 100 Ω, Rdry ~ 500,000 Ω
- 36. Voltage drives current: ↑ voltage ↑ current
- 37. Touching outlet while dry (120 V) small current
- 38. Wet while grounded ↑ current dramatically, poss. Fatal
- 40. Why birds sit on high voltage wires
- 41. Charges move down path of least resist. – the wires, not bird
- 43. To prevent this, a third wire of plug is grounded and connected to appliance
- 45. Alternating (AC) – charges move back and forth
- 46. In US, occurs 60 times/sec (60 Hz) at 120 V
- 47. The wires constantly change polarity
- 50. The e experience a force, moving them along E – field
- 51. Constant collisions (w/ rigid particles of conductor) cause heating & slow the motion of e – drift velocity
- 53. e do not come from power companies, they are already in the conductors (wires)
- 54. Power companies provide the energy (via an E-field) that causes the charges to move
- 56. P = I V
- 57. Provides a relationship between power & current
- 58. A kilowatt • hour = energy
- 59. Energy companies charge some amount per kilowatt • hour