Lecture 1: Intro & Circuit Variables Nilsson 1.1-1.6
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Transcript of Lecture 1: Intro & Circuit Variables Nilsson 1.1-1.6
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Lecture 1:Intro & Circuit VariablesNilsson 1.1-1.6
ENG17 (Sec. 2): Circuits I
Spring 2014
April 1, 2014
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Overview
• Personal Introduction• Course Introduction• Units• Circuit Analysis• Voltage & Current• Basic Circuit Element• Power & Energy
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Dr. Kyle Montgomery
• B.S. 2004 University of Houston• 3 years @ Schlumberger• M.S. 2008 Purdue University• Ph.D. 2012 Purdue University
– Thesis: Novel Approaches for Wide Bandgap Solar Cells
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What I do now…besides teach…
• Advise students• Research
– Novel solar cells w/compound semiconductors
– New materials for lighting, solar cells, and beyond
– High speed, high power transistors– Alternative energy storage solutions
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Philosophy…on teaching…and life
• Teaching is not confined to classroom time• Conceptual understanding is key• Life really sucks sometimes…how can I
help?
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Overview
• Personal Introduction• Course Introduction• Units• Circuit Analysis• Voltage & Current• Basic Circuit Element• Power & Energy
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ENG17: Circuits 1
• Electrical quantities and elements• Resistive Circuits• Transient and steady-state responses of
RLC circuits• Sinusoidal excitation and phasors• Complex frequency and network functions• Power Calculations
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Course Structure
• TAs– Yuhao Liu (sub: Akash Anand)– Lu Cai– Chi Van Pham– Wu Yu– Xin Zhao
• Course Website is:– http://www.kmontgomery.net/eng17
• Smartsite used primarily for grades• Also using Piazza
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Overview
• Personal Introduction• Course Introduction• Units• Circuit Analysis• Voltage & Current• Basic Circuit Element• Power & Energy
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SI Units
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Derived Units
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Prefixes
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Examples
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Overview
• Personal Introduction• Course Introduction• Units• Circuit Analysis• Voltage & Current• Basic Circuit Element• Power & Energy
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Big Picture
• Need justifies design
• Design specs filter to concept, circuit model, prototype
• Circuit analysis necessary for foundation
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Overview
• Personal Introduction• Course Introduction• Units• Circuit Analysis• Voltage & Current• Basic Circuit Element• Power & Energy
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Test Charge in a Field
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Work & Energy
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Electric Potential Energy
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Voltage
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Atom & Conductor in a Field
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Current
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Ohm’s Law
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Water Analogy
• Water pressure = voltage• Water flow = current
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Overview
• Personal Introduction• Course Introduction• Units• Circuit Analysis• Voltage & Current• Basic Circuit Element• Power & Energy
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Ideal Element
• Passive sign convention
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Fundamental Quantities
1.Voltage (v)2.Current (i)3.Charge (q)4.Flux (Φ)
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Overview
• Personal Introduction• Course Introduction• Units• Circuit Analysis• Voltage & Current• Basic Circuit Element• Power & Energy
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Power ≠ Energy
• Power = Time Derivative of Energy• UNITS!
– Power in Watts– Energy in Watt-hrs or Joules
• Positive Power = Power Delivered to Circuit
• Negative Power = Power Extracted from Circuit
𝑝=𝑑𝑤𝑑𝑡
𝑝=𝑖𝑣
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Recap
• Personal Introduction• Course Introduction• Units• Circuit Analysis• Voltage & Current• Basic Circuit Element• Power & Energy