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EE40 Lecture 08 - Energy Storage

# EE40 Lecture 08 - Energy Storage - EE40 Lecture 08 Energy...

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EE40 Lecture 08 Energy Storage Elements Neel Shah 7/11/11

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HW regrading There has been a little confusion regarding HW regrading... here is the final word. 1) The maximum number of points you can earn on a regrade is (100% - original score) / 2. 2) Each homework you submit ON TIME is eligible for ONE regrade opportunity. 3) You must include your original homework when you submit for regrading. 4) All regrade requests must be submitted before the final exam on 8/12.
Other logistics Please take the course survey if you haven’t already… https://fnnl.it/ctr Final Project Your project proposal/selection is due this Friday 7/15 Good idea: Talk to us in OH about your project! Your requested parts list is due next Friday 7/22 Midterm 2 is 7/27 Midterm 1 to be returned Wednesday…ish

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So far… All circuits we’ve dealt with have reacted instantaneously Change a resistance, voltage, or current, and everything else reacts instantly Obviously this isn’t a complete model for electronic device. Why? J Hug, 2010.07.12
For the next few days… We’ll be talking about elements with memory Capacitors and Inductors The first few weeks have just dealt with memoryless elements and how to convert them into algebraic equations On Wednesday we’ll talk about how to convert circuits with memory into differential equations After that will be about how we can use algebraic equations for circuits with memory if we have AC sources J Hug, 2010.07.12

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The Capacitor The basic idea is pretty simple Imagine you have two parallel metal plates, both of which have equal and opposite excess charges Plates are separated by an insulating layer (air, glass, wood, etc) • The charges would love to balance out • Insulator blocks them (just as the ground blocks you from falling into the center of the earth) J Hug, 2010.07.12
The Capacitor If you were to connect a resistive wire to the plates Charges would flow through the wire Induces a current And heat dissipation P = I 2 R J Hug, 2010.07.12

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The Capacitor Remember that a voltage is the electrical potential between two points in space The charge imbalance generates an E-field And thus a voltage: Simplifies to V = E*L, just like the lightning bolt… What is the field strength dependent upon?
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