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Ch22.1 – Current Electricity

Ch22.1 – Current Electricity. Ch22.1 – Current Electricity. To get a current (a flow of charged particles), need to create a potential difference and sustain it. - batteries, generators. Battery - place any 2 different materials in contact, electrons flow.

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Ch22.1 – Current Electricity

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  1. Ch22.1 – Current Electricity

  2. Ch22.1 – Current Electricity To get a current (a flow of charged particles), need to create a potential difference and sustain it. - batteries, generators Battery - place any 2 different materials in contact, electrons flow

  3. Ex1: what is the potential difference between: Electronic series for several metals 1) Gold and copper? Lithium Potassium Sodium Aluminum Zinc Iron Nickel Tin Lead Hydrogen Copper Mercury Silver Platinum Gold • 3.0V • -2.9V • -2.7V • -1.7V • -.76V • -.44V • -.26V • -.14V • -.13V • 0V • .34V • .8V • .8V • 1.2V • 1.3V 2)Silver and lithium? 3) Iron and potassium? 4) Zinc and copper? 5) Copper and nickel

  4. Ex1: what is the potential difference between: Electronic series for several metals 1) Gold and copper? Lithium Potassium Sodium Aluminum Zinc Iron Nickel Tin Lead Hydrogen Copper Mercury Silver Platinum Gold • 3.0V • -2.9V • -2.7V • -1.7V • -.76V • -.44V • -.26V • -.14V • -.13V • 0V • .34V • .8V • .8V • 1.2V • 1.3V (1.3V) – (.34V) = .96V 2)Silver and lithium? (.8V) – (-3.0V) = 3.8V 3) Iron and potassium? (-.44V) –(-2.9V) = 2.46V 4) Zinc and copper? (.34V) – (-.76V) = 1.10V 5) Copper and nickel (.34V) – (-.26V) = .6V

  5. Current (I) - rate at which charge flows q Coulombs Amps = I = sec t Ex2: The belt on the Van de Graaf generator carries 20µC of charge to the sphere when it rotates in 2 seconds. Determine the current. Ex3: The starter motor in a car draws 180A of current from the battery in about 2 seconds. How much charge is flowing thru the circuit?

  6. Resistance (R) – resists the flow of current. Symbol: - usually made of semi conductive materials, like carbon - resistors are small usually, so use a color code to ID Color Code Ex4) What is the resistance of: Red, green, blue, gold Ex5) brown, black brown, gold Ex6) Color stripes for 4000Ω +/-10% 0 1 2 3 4 5 6 7 8 9 +/- 5% +/- 10% Black Brown Red Orange Yellow Green Blue Violet Gray White Gold Silver Ch22 HW #1

  7. Resistance (R) – resists the flow of current. Symbol: - usually made of semi conductive materials, like carbon - resistors are small usually, so use a color code to ID Ex4) What is the resistance of: Red, green, blue, gold 25 x 106Ω +/-5% Ex5) brown, black brown, gold 10 x 101Ω +/-10% Ex6) Color stripes for 4000Ω +/-10% Yellow, black, red, silver Color Code 0 1 2 3 4 5 6 7 8 9 +/- 5% +/- 10% Black Brown Red Orange Yellow Green Blue Violet Gray White Gold Silver Ch22 HW #1

  8. Lab22.1 Batteries - Lab due tomorrow - Ch22 HW#1 due at beginning of period

  9. Ch22 HW#1 1 – 10 • 1. What is the potential for a wet cell battery made with nickel and zinc? • 2. What is the potential for a wet cell battery made with • Al and mercury? • 3. What is the potential for a wet cell battery made with • Pt and Cu? • 4. What is the potential for a wet cell battery made with sodium and tin?

  10. Ch22 HW#1 1 – 10 • 1. What is the potential for a wet cell battery made with nickel and zinc? • -.76 – (-.26) = .5V • 2. What is the potential for a wet cell battery made with • Al and mercury? • -1.7 – (.80) = 2.5V • 3. What is the potential for a wet cell battery made with • Pt and Cu? • 4. What is the potential for a wet cell battery made with sodium and tin?

  11. Ch22 HW#1 1 – 10 • 1. What is the potential for a wet cell battery made with nickel and zinc? • -.76 – (-.26) = .5V • 2. What is the potential for a wet cell battery made with • Al and mercury? • -1.7 – (.80) = 2.5V • 3. What is the potential for a wet cell battery made with • Pt and Cu? • .34 – (1.2) = .86V • 4. What is the potential for a wet cell battery made with sodium and tin? • -.14 – (-2.7) = 2.56V

  12. 5. What is the current when 25 C of charge pass by a point in 10 seconds? • 6. What is the current when 4.5 C pass by a point • in 3.2 seconds? • 7. What is the resistor with the colors: • gray, green, red, silver? • 8. What is the resistor with the colors: • red, green, brown, gold? • 9. Write the color band for a 1000, +/- 5% resistor. • 10. Write the color band for a 300,000, +/-10% resistor.

  13. 5. What is the current when 25 C of charge pass by a point in 10 seconds? • I = q/t = 25C/10s = 2.5A • 6. What is the current when 4.5 C pass by a point • in 3.2 seconds? • 7. What is the resistor with the colors: • gray, green, red, silver? • 8. What is the resistor with the colors: • red, green, brown, gold? • 9. Write the color band for a 1000, +/- 5% resistor. • 10. Write the color band for a 300,000, +/-10% resistor.

  14. 5. What is the current when 25 C of charge pass by a point in 10 seconds? • I = q/t = 25C/10s = 2.5A • 6. What is the current when 4.5 C pass by a point • in 3.2 seconds? • I = q/t = 4.5x10-6C/3.2s = 1.4x10-6A • 7. What is the resistor with the colors: • gray, green, red, silver? • 8. What is the resistor with the colors: • red, green, brown, gold? • 9. Write the color band for a 1000, +/- 5% resistor. • 10. Write the color band for a 300,000, +/-10% resistor.

  15. 5. What is the current when 25 C of charge pass by a point in 10 seconds? • I = q/t = 25C/10s = 2.5A • 6. What is the current when 4.5 C pass by a point • in 3.2 seconds? • I = q/t = 4.5x10-6C/3.2s = 1.4x10-6A • 7. What is the resistor with the colors: • gray, green, red, silver? • 85x102Ω ± 10% • 8. What is the resistor with the colors: • red, green, brown, gold? • 9. Write the color band for a 1000, +/- 5% resistor. • 10. Write the color band for a 300,000, +/-10% resistor.

  16. 5. What is the current when 25 C of charge pass by a point in 10 seconds? • I = q/t = 25C/10s = 2.5A • 6. What is the current when 4.5 C pass by a point • in 3.2 seconds? • I = q/t = 4.5x10-6C/3.2s = 1.4x10-6A • 7. What is the resistor with the colors: • gray, green, red, silver? • 85x102Ω ± 10% • 8. What is the resistor with the colors: • red, green, brown, gold? • 25 x 101Ω ± 5% • 9. Write the color band for a 1000, +/- 5% resistor. • 10. Write the color band for a 300,000, +/-10% resistor.

  17. 5. What is the current when 25 C of charge pass by a point in 10 seconds? • I = q/t = 25C/10s = 2.5A • 6. What is the current when 4.5 C pass by a point • in 3.2 seconds? • I = q/t = 4.5x10-6C/3.2s = 1.4x10-6A • 7. What is the resistor with the colors: • gray, green, red, silver? • 85x102Ω ± 10% • 8. What is the resistor with the colors: • red, green, brown, gold? • 25 x 101Ω ± 5% • 9. Write the color band for a 1000, +/- 5% resistor. • brown, black, red, gold • 10. Write the color band for a 300,000, +/-10% resistor.

  18. 5. What is the current when 25 C of charge pass by a point in 10 seconds? • I = q/t = 25C/10s = 2.5A • 6. What is the current when 4.5 C pass by a point • in 3.2 seconds? • I = q/t = 4.5x10-6C/3.2s = 1.4x10-6A • 7. What is the resistor with the colors: • gray, green, red, silver? • 85x102Ω ± 10% • 8. What is the resistor with the colors: • red, green, brown, gold? • 25 x 101Ω ± 5% • 9. Write the color band for a 1000, +/- 5% resistor. • brown, black, red, gold • 10. Write the color band for a 300,000, +/-10% resistor. • orange, black, yellow, silver

  19. Ch22.1Equivalent resistance When resistors are in series (one attached to next, etc), just add them up. Req = R1 + R2 +… Ex1) What is the equivalent resistance? 2Ω 3Ω 1Ω 2Ω 3Ω 4Ω 4Ω 4Ω 4Ω

  20. Ch22.1Equivalent resistance When resistors are in series (one attached to next, etc), just add them up. Req = R1 + R2 +… Ex1) What is the equivalent resistance? 2Ω 3Ω = 5Ω 1Ω 2Ω 3Ω = 6Ω = 16Ω 4Ω 4Ω 4Ω 4Ω

  21. When resisters are in parallel (on different branches), use formula: Ex2) Find Req : 2Ω 2Ω 3Ω 4Ω 5Ω 5Ω 5Ω

  22. Complicated resistors: Ex3) Find Req: 1Ω 1Ω 1Ω = 1Ω 1Ω 1Ω = 1Ω 1Ω 1Ω

  23. Complicated resistors: Ex3) Find Req: 1Ω 1Ω 1Ω 1Ω .5Ω =1.5Ω = 1Ω 1Ω 1Ω = 1Ω 1Ω 1Ω .5Ω 1Ω 1.5Ω 2Ω 1Ω 1Ω = 2Ω 1Ω.86Ω = 1.86Ω

  24. Ohm’s Law - voltage, current, & resistance are related by: V= I.R Ex4) A 12V battery is attached to 100Ω resistor. What current passes through the circuit? 12V 100Ω Ex5) A 20V battery pushes 2A thru a circuit. What kind of resistance does it feel? I = 2A ? 20V Ch22 HW#2 11-20

  25. Ch22 HW#2 11 – 20 • For 11 – 14, what is the equivalent resistance of: • 11. Two 10  resistors in series. • 10  10  • 12. Two 10  resistors in parallel. 10  • 10  • 13. A 10 , 25 , and a 35  resistor in series. • 10  25  35  • 14. A 300  and a 150  resistor in parallel. • 300  • 150 

  26. Ch22 HW#2 11 – 20 • For 11 – 14, what is the equivalent resistance of: • 11. Two 10  resistors in series. • 10  10  = 20 • 12. Two 10  resistors in parallel. 10  • = 5 • 10  • 13. A 10 , 25 , and a 35  resistor in series. • 10  25  35  • 14. A 300  and a 150  resistor in parallel. • 300  • 150 

  27. Ch22 HW#2 11 – 20 • For 11 – 14, what is the equivalent resistance of: • 11. Two 10  resistors in series. • 10  10  = 20 • 12. Two 10  resistors in parallel. 10  • = 5 • 10  • 13. A 10 , 25 , and a 35  resistor in series. • 10  25  35  = 70 • 14. A 300  and a 150  resistor in parallel. • 300  • = 100 • 150 

  28. What is the equivalent resistance of: • 15. • 5 10  12  = • 16. 12  • = • 6  • 17. 20  • 20  • = • 20 • 20

  29. What is the equivalent resistance of: • 15. • 5 10  12  = 27 • 16. 12  • = 4 • 6  • 17. 20  • 20  • = • 20 • 20

  30. What is the equivalent resistance of: • 15. • 5 10  12  = 27 • 16. 12  • = 4 • 6  • 17. 20  • 20  • = 5 • 20 • 20

  31. 18. A 9 V battery feels a resistance of 18  in the circuit it is attached to. • How much current will it produce? • 19. A 1.5 V D-Cell battery produces 0.75 A when in a circuit. • How much resistance is in this circuit? • 20. A 100  resistor has 1.1 A passing through it. What kind of voltage might cause this? 9V 18Ω I = .75A ? 1.5V I=1.1A R=100  V=?

  32. 18. A 9 V battery feels a resistance of 18  in the circuit it is attached to. • How much current will it produce? • 19. A 1.5 V D-Cell battery produces 0.75 A when in a circuit. • How much resistance is in this circuit? • 20. A 100  resistor has 1.1 A passing through it. What kind of voltage might cause this? 9V 18Ω I = .75A ? 1.5V I=1.1A R=100  V=?

  33. 18. A 9 V battery feels a resistance of 18  in the circuit it is attached to. • How much current will it produce? • 19. A 1.5 V D-Cell battery produces 0.75 A when in a circuit. • How much resistance is in this circuit? • 20. A 100  resistor has 1.1 A passing through it. What kind of voltage might cause this? 9V 18Ω I = .75A ? 1.5V I=1.1A R=100  V=?

  34. 18. A 9 V battery feels a resistance of 18  in the circuit it is attached to. • How much current will it produce? • 19. A 1.5 V D-Cell battery produces 0.75 A when in a circuit. • How much resistance is in this circuit? • 20. A 100  resistor has 1.1 A passing through it. What kind of voltage might cause this? • V = I.R = (1.1A)(100Ω) • = 110V 9V 18Ω I = .75A ? 1.5V I=1.1A R=100  V=?

  35. Ch22.1 cont. 2Ω 2Ω 1) 2Ω 2Ω 2Ω = 2Ω 2Ω 2Ω

  36. 10Ω Ex2) 10Ω 10Ω 5Ω 8Ω 4Ω 4Ω 8Ω 8Ω

  37. Current - in a series circuit, current stays the same through out circuit. - in a parallel circuit, current splits up to the branches. Ex3) How much does each ammeter read? 5Ω 1) 3V 4Ω A

  38. Current - in a series circuit, current stays the same through out circuit. - in a parallel circuit, current splits up to the branches. Ex3) How much does each ammeter read? 5Ω 1) Req : 5+4 = 9 3V 4Ω V 3V Req 9Ω I = = = .33A A

  39. 2) A 18V 15Ω 10Ω

  40. 2) A 18V 15Ω 10Ω V 50V Req 6Ω = = I = 8.3A

  41. 3) 2Ω 10V 12Ω 6Ω A

  42. A A1 A2 4) 12V 4Ω 4Ω

  43. A A1 A2 5) 18V 3Ω 6Ω Ch22 HW#3 21 – 27

  44. 6Ω 2Ω 6Ω Ch22 HW#3 21 – 27 21. 22. 23. 12Ω 8Ω 8Ω 12Ω 2Ω 3Ω 3Ω 2Ω

  45. 6Ω 2Ω 6Ω Ch22 HW#3 21 – 27 21. = 5Ω 22. 23. 12Ω 8Ω 8Ω 12Ω 2Ω 3Ω 3Ω 2Ω

  46. 6Ω 2Ω 6Ω Ch22 HW#3 21 – 27 21. = 5Ω 22. = 9.6Ω (4.8Ω) (4.8Ω) 23. 12Ω 8Ω 8Ω 12Ω 2Ω 3Ω 3Ω 2Ω

  47. 6Ω 2Ω 6Ω Ch22 HW#3 21 – 27 21. = 5Ω 22. = 9.6Ω (4.8Ω) (4.8Ω) 23. = 2.5Ω 12Ω 8Ω 8Ω 12Ω 2Ω 3Ω 3Ω 2Ω

  48. 1Ω 1Ω 1Ω 24. 1Ω 1Ω 1Ω 1Ω 1Ω

  49. 1Ω 1Ω 1Ω 24. = 8Ω 1Ω 1Ω 1Ω 1Ω 1Ω

  50. A 12V 25. What does the ammeter read? 26. What does the ammeter read? 5Ω A 10V 2Ω 3Ω

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