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<!DOCTYPE html>
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<head>
<title>EE281-Electric Circuits</title>
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class: center, middle
# EE-281 ELECTRIC CIRCUITS
## Ozan Keysan
[ozan.keysan.me](http://ozan.keysan.me)
Office: C-113 <span class="meta">•</span> Tel: 210 7586
---
# About the Course
## Lecture Hours
### - Monday: 08:40-10:30 (Office Hour: 10:40-11:30)
### - Thursday: 10:40-11:30
## Webpage: [keysan.me/ee281](http://keysan.me/ee281)
## Lecture Notes: [ozank.gitbooks.io/ee281/](http://ozank.gitbooks.io/ee281/)
### Announcements: [COW.ceng.metu.edu.tr](http://cow.ceng.metu.edu.tr)
---
# Grading:
## - Midterms: 20% Each
## - Final: 30%
## - Laboratory: 20%
## - Quizes: 10%
---
# Grading
### -To get a passing grade you need to have 100% attendance to labs
### -The following conditions should be met to take the final exam
#### -at least 50% of lab grades
#### -at least 30% of midterm exam grades
#### -at least 30% of in-class exam grades
---
# Textbooks:
### - **Electric Circuits**, 8th Ed. James W. Nilsson, Susan A. Riedel, Prentice Hall, 2008. (Preferred)
### - **Electric Circuit Analysis**, 3rd Ed. D.E. Johnson, J.R. Johnson, J.L. Hilburn, P.D.Scott, Prentice Hall, 1997.
### - Any other reference book should be ok.
## Online Sources:
#### - A list of online sources are available in [keysan.me/ee281](keysan.me/ee281).
---
# Course Outline: From Nilsson & Riedel:
####1. Basic Concepts (Ch. 1)
####2. Basic Laws (Ch. 2)
####3. Resistive Circuits (Ch. 3)
####4. Methods of Analysis (Ch. 4)
####5. Circuit Theorems (Ch. 4)
####6. Operational Amplifiers (Ch. 5)
####7. Capacitors And Inductors (Ch.6 upto 6.5)
####8. First Order Circuits (Ch. 7)
####9. Phasors and Sinusoids (Ch. 9)
---
## Electric Circuit
Interconnection of electrical elements
<img src="http://upload.wikimedia.org/wikipedia/commons/2/2a/Electric_circuit_RCL.jpg" alt="Drawing" style="width: 500px;"/>
---
# A More Generalized View
--
## 1- Take a Real-World Problem
<img src="https://c2.staticflickr.com/4/3639/3403005971_6bdcbb8ac5_z.jpg" alt="Drawing" style="width: 500px;"/>
---
# A More Generalized View
## 2- Simplify and represent it as a model
--
<img src="http://upload.wikimedia.org/wikipedia/commons/2/2a/Electric_circuit_RCL.jpg" alt="Drawing" style="width: 600px;"/>
---
# A More Generalized View
## 3- Represent the Model Mathematically & Solve
--
`$$ \begin{array}{ccl}
a_{11}x_1 & + a_{12}x_2 + \cdots + & a_{1n}x = 0 \\
\;\vdots & &\quad\vdots \\
a_{m1}x_1 &+ a_{m2}x_2 + \cdots +& a_{mn}x_n = 0
\end{array} $$`
---
# Not Limited to Electric Circuits
--
## Thermal Problems
<img src="http://upload.wikimedia.org/wikipedia/commons/3/3a/SpaceX_engine_test_fire.jpg" alt="Drawing" style="width: 300px;"/>
<img src="http://www.ecosimpro.com/wp-content/uploads/2015/04/product_ecosimpro_screenshot1.png" alt="Drawing" style="width: 420px;"/>
Thermal modelling of a thruster
---
# Not Limited to Electric Circuits
## Mechanical Problems
<img src="http://upload.wikimedia.org/wikipedia/commons/d/d0/Shanghai_Transrapid_002.jpg" alt="Drawing" style="width: 400px;"/>
--
<img src="https://raw.githubusercontent.com/ozank/ee281/master/images/train_circuit.png" alt="Drawing" style="width: 300px;"/>
Mechanical modelling of a magnetic levitation train
---
class: center
# Remember the Big Picture!
<img src="https://raw.githubusercontent.com/ozank/ee281/master/images/problem_modelling.png" alt="Drawing" style="width: 200px;"/>
---
#Embedded Systems
<img src="http://hsc.com/Portals/0/images/Blog/uploads/2014/02/bigstock-close-up-of-electronic-circuit-38621053.jpg" alt="Drawing" style="width: 700px;"/>
---
# Recognize any of these?
--
<img src="http://mrickert.com/wp-content/uploads/2013/04/rasppi.jpg" alt="Drawing" style="width: 700px;"/>
--
### [Raspberry Pi](https://www.raspberrypi.org/)
---
# Recognize any of these?
<img src="https://www.arduino.cc/en/uploads/Guide/ArduinoNanoUSBCable.jpg" alt="Drawing" style="width: 600px;"/>
--
### [Arduino](https://www.arduino.cc/)
---
# Recognize any of these?
<img src="https://software.intel.com/sites/default/files/managed/ab/52/iot_edison.png" alt="Drawing" style="width: 700px;"/>
--
### [Intel Edison](https://www.raspberrypi.org/)
---
# Recognize any of these?
<img src="https://www.filepicker.io/api/file/GRfBJYSMSgel7wOh4mwH" alt="Drawing" style="width: 600px;"/>
--
### [Particle Photon](https://www.particle.io/)
---
# Any questions up to here?
---
# Basics
## SI Units:
--
###- kg, m, N, V, A ...
--
## SI Prefixes:
- Mega (M) \\(10^6\\)
- Kilo (k) \\(10^3\\)
- Mili (m) \\(10^{-3}\\)
- Micro (\\(\mu\\)) \\(10^{-6}\\)
- Nano (n) \\(10^{-9}\\)
- Pico (p) \\(10^{-12}\\)
---
# Electric Charge
The unit of charge is Columbs (C), which is equal to charge of \\(6.24 \times 10^{18}\\) electrons.
<img src="http://regentsprep.org/regents/physics/phys03/afieldint/fieldf.gif" alt="Drawing" style="width: 300px;"/>
<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/e/ed/VFPt_charges_plus_minus_thumb.svg/300px-VFPt_charges_plus_minus_thumb.svg.png" alt="Drawing" style="width: 300px;"/>
---
# Current
#### Current is the rate of charge flow: $$i=\frac{dq}{dt}$$.
### 1 A equals to 1 Coulomb/seconds.
<img src="http://www.rkm.com.au/ANIMATIONS/animation-graphics/circuit-diagram.jpg" alt="Drawing" style="width: 300px;"/>
---
# Voltage
Voltage is related to the strength of the electric field. It is analogous to pressure in a hydraulic circuit.
###! Voltage is always measured between two points, that is why it is also called potential difference.
--
## Analogy to Hydraulic System
#### - Voltage --> Pressure
#### - Electric Current --> Water Current
#### - Tap Resistance --> Resistance
---
# Power
Power is the rate of energy (dissipating or absorbing), denoted by P:
### $$P=\frac{dw}{dt}$$
In electric circuits power is equal to multiplication of voltage and current.
### $$Power = Voltage \times Current$$
### $$P = VI$$
The unit of power is **Watt**.
---
# Energy
--
The unit of energy is Joules, which is also equal to watt.seconds.
#### $$w=\int P(t) dt = \int V(t) I(t) dt$$
#### It is also common practice to express electrical energy in kilo-watt hours (**kWh**).
Example: Electricity bills([photo1](https://raw.githubusercontent.com/ozank/ee281/master/images/fatura1.jpg), [photo2](https://raw.githubusercontent.com/ozank/ee281/master/images/fatura2.jpg)) are calculated in terms of kWh.
---
# Any questions?
## You can download this presentation from: [keysan.me/ee281](http://keysan.me/ee281)
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