1. Electric Currents & Circuits AP – Ch 20 & 21

2. Teaching LAB YOU teach – Simple Circuit – Series Circuit – Parallel Circuit – Combo Circuit – Kirchoff’s Laws

3. Ch 20 & 21 Outline 1 st Half of PPTX – New stuff from OpenStax text 2 nd Half – My old stuff

5. Current

6. Figure 20.2 The rate of flow of charge is current. An ampere is the flow of one coulomb through an area in one second.

8. Note Direction of I…

9. Conventional Current Physical Current + + - -

11. Ohm’s Law

12. Started as two proportions – I through a RESISTOR  V drop – I through a RESISTOR  1/R of resistor Put together:

14. Ohmic Material Any material where R is independent of I and V – Most metals & common conductors

16. Resistivity

19. Electrical Power

20. Intro Stuff Power – Same as regular P, but different

21. Intro Stuff Power …

24. Sect 20.6: Hume Bean Hazards

25. Ch 21: Circuits

44. Intro Stuff Electromotive Force – emf Maximum V of battery Current – Flow of charge

45. Intro Stuff

46. Ohm ’ s Law – States linear relationship between V & R

47. Intro Stuff Resistance – Says what it means e - has to ‘ fight ’ thru a wire or ‘ resistor ’

49. Intro Stuff Resistance – Radio Shack SCAM!

50. Intro Stuff Resistance – Radio Shack SCAM!

52. CONVENTIONAL Current ELECTRON Current

53. CONVENTIONAL Current ELECTRON Current

69. Intro Stuff Wiring Circuits – Series / Parallel Parallel

71. Quantitative Summary

72. Coulomb’s Law: Force between any 2 charges

73. Electric Field Strength: Force on test Q

74. Electric Potential Energy: Fd

75. Electric Field (av): Potential at a distance

76. Electric POTENTIAL: NOT a vector…

77. Definition of Electrical Current: SI Unit - Amps

78. Definition of Electrical Current: SI Unit – Amps (A)

79. Resistance in a WIRE: SI Unit – Ohms (  )

80. OHM’S LAW: All Circuits Must Obey…

81. OHM’S LAW: All Circuits Must Obey… 12V 6666

82. Electrical Power: From P=W/t

83. Series Circuits

84. Parallel Circuits

87. EXAMPLE #1 Three 12  resistors are used in two circuits; one in series and one in parallel. What is the R equivalent of each circuit?

88. Series 12 

89. Parallel 12 

91. Series + Parallel 12  66 18 