Lecture 1:
Intro & Circuit Variables
Nilsson 1.1-1.6
ENG17 (Sec. 2): Circuits I
Spring 2014
April 1, 2014
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Overview
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Personal Introduction
Course Introduction
Units
Circuit Analysis
Voltage & Current
Basic Circuit Element
Power & Energy
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Dr. Kyle Montgomery
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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
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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
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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
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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
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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
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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
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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
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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
𝑝=
𝑑𝑤
𝑑𝑡
𝑝 = 𝑖𝑣
• Positive Power = Power Delivered to
Circuit
• Negative Power = Power Extracted from
Circuit
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Recap
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Personal Introduction
Course Introduction
Units
Circuit Analysis
Voltage & Current
Basic Circuit Element
Power & Energy
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