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Lect21 - Physics 212 Lecture 21 Slide Physics 212 Lecture...

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Unformatted text preview: Physics 212 Lecture 21, Slide Physics 212 Lecture 21, Slide 1 Physics 212 Physics 212 Lecture 21 Lecture 21 10 20 30 40 50 Avg Avg = 2.5 = 2.5 Confused Confused Confident Confident Physics 212 Lecture 21, Slide Physics 212 Lecture 21, Slide 2 Music Who is the Artist? Who is the Artist? A) A) Earth, Wind & Fire Earth, Wind & Fire B) B) War War C) C) Tower of Power Tower of Power D) D) Average White Band Average White Band E) E) Chicago Chicago Why? Why? Topic for today = Power Topic for today = Power Why not Tower of Power ??? Why not Tower of Power ??? Memories from Bay Area Memories from Bay Area …… …… Physics 212 Lecture 21, Slide Physics 212 Lecture 21, Slide 3 Physics 212 Physics 212 Lecture 21 Lecture 21 10 20 30 40 50 Avg Avg = 2.5 = 2.5 Confused Confused Confident Confident Physics 212 Lecture 21, Slide Physics 212 Lecture 21, Slide 4 Peak AC Problems • “Ohms” Law for each element – V gen = I Z – V Resistor = I R – V inductor = I X L – V Capacitor = I X C • Typical Problem A generator with peak voltage 15 volts and angular frequency 25 rad/sec is connected in series with an 8 Henry inductor, a 0.4 mF capacitor and a 50 ohm resistor. What is the peak current through the circuit? L X L ϖ = ( 29 2 2 L C Z R X X = +- 1 C X C ϖ = 07 L R C 200 L X L ϖ = = Ω 1 100 C X C ϖ = = Ω ( 29 2 2 112 L C Z R X X = +- = Ω 0.13 Amps gen V I Z = = Physics 212 Lecture 21, Slide Physics 212 Lecture 21, Slide 5 Peak AC Problems • “Ohms” Law for each element – V gen = I Z – V Resistor = I R – V inductor = I X L – V Capacitor = I X C • Typical Problem A generator with peak voltage 15 volts and angular frequency 25 rad/sec is connected in series with an 8 Henry inductor, a 0.004 Farad capacitor and a 50 ohm resistor. What is the peak current through the circuit? Which element has the largest peak voltage across it? A) Generator E) All the same. B) Inductor C) Resistor D) Capacitor = max max V I X 12 L R C L X L ϖ = ( 29 2 2 L C Z R X X = +- 1 C X C ϖ = 200 L X L ϖ = = Ω 1 100 C X C ϖ = = Ω ( 29 2 2 112 L C Z R X X = +- = Ω 0.13 Amps gen V I = = BB BB Physics 212 Lecture 21, Slide Physics 212 Lecture 21, Slide...
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