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EE40 Lecture 14 - Power Handling

EE40 Lecture 14 - Power Handling - EE40 Lecture 14 Complex...

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EE40 Lecture 14 Complex Power Handling Neel Shah 7/25/2011
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Class HW4 due tomorrow, 5pm Midterm 2 Wednesday in class Start at 12.05 pm, bring a calculator, same rules Final project parts to be issued next week Structured project parts are here, talk to lab staff about when you can start Other dates HW5 due 8/5, HW6 due 8/10, Final on 8/12 Final project writeupdue 8/11 around 6 pm Guest lecture today, 1-2 Prof. Bart Muthuswamyon chaotic circuits!
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Power Handling Basics We have power generators, like V/I sources We have power dissipators(R’s) We have power thieves (L’s and C’s) We call these reactances (X’s) An impedance Z = R±jX And (ideal) power converters (XFMR’s) Inductor reactance X L = ωL Capacitor reactance X C = -1/ωC
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AC Power in a Resistive Element Loads like lightbulbs, speakers, and fridges are driven by AC! Assume the input is The current through the load is So the power is
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AC Power in a Resistive Element Instantaneous power Apply a trig identity The average value is
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