1. Pre-Class Tuesday
What do you think an Electrical Engineer does?

2. Pre-Class Tuesday
Today’s date is a binary number. What would be the decimal (base 10) value for it? 47

3. Electrical Engineering
The world's leading professional association for the advancement of technology

4. Electrical Specifics The most common/populated engineering field
Responsible for the design, development, testing, and supervision of the manufacture of electrical equipment (from household appliances to satellite systems)
Any product that has electricity falls under their “jurisdiction”
Main areas: Power generation, transmission, and distribution; communications; computer electronics; electrical equipment manufacturing

5. 8 Major Categories Computers  Computer Engineering branch
Communications  Global Positioning Systems (GPS), fiber optics, and lasers
Circuits and solid-state devices  making electronic devices smaller and more efficient
Control  reliable, efficient, and safe electronics
Instrumentation  measuring how an electronic device is performing as compare to its specs
Signal processing  filtering, amplifying, and modifying any signal (digital or otherwise)
Bioengineering  non-invasive techniques (Magnetic Resonance Imaging, MRI, or Computer Automated Tomography, CAT, scan)
Power  the most traditional of them all, electrical power

6. Pre-Class Wednesday 10-12-11
Why is Electrical Engineering so important to everyday life?

7. Making a Testing Apparatus
Objective
Design and construct a battery holder.
Materials
Index card ■ AA battery (s)
2 paper clips ■ 10 cm of masking tape
Procedures
Design a battery holder for a C-cell that allows for connection to wires on both sides.
Use materials to construct it.
Use your testing apparatus in the following lab.

8. Insulation vs. Conduction
Objectives
To determine what conducts electricity
Materials
Wires
Light bulbs
Procedures
Divide into groups of 2 or 3.
Obtain materials from cart.
Test 8-10 items.
C-cell Battery
Other?

9. Pre-Class Thursday
What is the word in black? If it were resting on a mirror or a light were behind it to cast a shadow below it, what would it read?

10. The largest, most prominent engineering field
Aerospace
Antenna
Broadcast
Communications
Computer
Control Systems
Lasers
Power
Robotics
Signal Processing
Wireless
Starting salary in 2008: $59,110 (BS), $70,630 (MS), $87,380 (PhD)
Average salary in 2005: $51,773

11. CURRENT The flow of positive charges (in theory)
The flow of negative charges (in real life)
A river of electrical energy that moves through a wire
Must have a closed continuous loop to work

12. VOCABULARY VOCABULARY Current Battery Resistance Ammeter Voltmeter
number of charges that travel per second
Battery
voltage (source)
Resistance
impedes current
uses energy
Ammeter
measures current
Voltmeter
measure voltage
Measured in Amperes
Amps or A
Measured in Volts
Volts or V
Measured in Ohms
ohms (W)
Measures Amps
Measures Volts
VOCABULARY
VOCABULARY

13. Schematics A sketch of what the circuit looks like
Represents how the current will flow in the circuit
Specific types of symbols for sketches

15. CIRCUITS PARALLEL current has multiple paths to follow
broken circuit may not stop electrical flow
voltage is the same through each resistor
current adds for each
SERIES
current has only one path to follow
broken circuit stops all flow of electricity
current is the same through each resistor
voltage adds for each

16. Schematics Lab Objective Materials Procedures Questions
Construct two simple circuits.
Draw schematics of simple circuits.
Materials
Battery holder ■ AA battery (s)
Wires ■ Voltmeter
2 light bulbs ■ Ammeter
Procedures
Construct a simple series circuit.
Measure and record the current and voltage through the light bulb.
Draw a schematic of the series circuit.
Construct a simple parallel circuit.
Measure and record the current and voltage through each light bulb.
Draw a schematic of the parallel circuit.
Questions
The ammeter was to be wired in series. Explain why.
The voltmeter was to be wired in parallel. Explain why.
For a circuit to work (assuming you have power and proper equipment), what is vital?

17. Pre-Class Friday
Draw and label a circuit with the proper schematic symbols containing a battery, a resistor, and a switch.

18. CIRCUITS PARALLEL current has multiple paths to follow
broken circuit may not stop electrical flow
voltage is the same through each resistor
current adds for each
SERIES
current has only one path to follow
broken circuit stops all flow of electricity
current is the same through each resistor
voltage adds for each

19. OHM’S LAW
Ohm defined how current(amps), voltage(volts), and resistance(ohms=W) relate
V = I R
V : voltage of battery (e.g. 9 V battery)
I : current (number of charges per second)
R : resistance (e.g. light bulb, stereo, etc.)

20. Remember: Power is energy per time (P=E/t)
Electrical Power
P = I2 R = V2/ R = I V
P : power (Watts)
I : current (Amps)
R : resistance (W)
V : voltage (Volts)
Remember: Power is energy per time (P=E/t)

21. Ohm’s Lab Materials Objectives 1.5 V battery 4 sets of wires Ammeter
Voltmeter
2 light bulbs
Switch
Objectives
To explore how to wire a circuit correctly
To use Ohm’s Law in calculations
To practice drawing schematics

22. Procedures Determine the voltage of your battery. Record its values.
Connect the 1.5 V battery to the light bulb and switch. Measure the current through the circuit (ammeter) and the voltage drop across the light bulb (voltmeter). Record their values.
Draw a schematic of step 2.
Add another light bulb to the circuit (series). Measure the current through the circuit and the voltage drop across both light bulbs. Record their values.
Draw a schematic for step 4.
Repeat steps 4 and 5 with the light bulbs being in parallel.
The 6 V battery provides too much energy for the light bulbs for an extended time. Using the resistors provided and the knowledge gained already, make a stable circuit to provide a bright, long-lasting bulb.
Draw a schematic for step 7.
Measure the current through and the voltage drop across each resistor and light bulb. Record their values.
Find the resistance of each light bulb and resistor for every step. Record their values.

23. Table Step V1 ( ) V2 ( ) I1 ( ) I2 ( ) R1 ( ) R2 ( ) 2 4 6 9
Questions:
What happens to the current in a series circuit? Parallel?
What happens to the voltage in a series circuit? Parallel?

24. Pre-Class Monday
What is Ohm’s Law?

26. Producing Light Incandescent Fluorescent
A piece of metal in a closed space is heated by electricity
Filament (glowing metal) made of tungsten
Fluorescent
An electric current is sent through a gas (mercury and argon) in a closed space
Similar to lightning
All artificial producers of light follow one of these two methods. The only exception is a laser.

27. Pre-Class Monday
There are four ways to change the internal resistance of a wire. Give me one of them.

28. NOTE: Wood is not a good conductor nor insulator.
CONDUCTIVE MATERIALS
INSULATOR
charges do not flow freely
impedes electricity
e.g. rubber , plastic
CONDUCTOR
charges flow freely
allows electricity to flow through it
e.g. metals
NOTE: Wood is not a good conductor nor insulator.

29. Lightning (and electrical) Safety
Attracted to tall, pointy conductors
Safest place: car
Beware of storing charge accidently
Always switch off the breaker before working on wires in the home.

30. Getting started in Solid Edge
Solid Edge Fundamentals ST2 30

31. Start  Programs  Solid Edge V20
Solid Edge Environments:
Part
Sheet Metal Part
Weldment
Assembly
Draft 31

33. Schematics in Solid Edge
Solid Edge is a 2D and 3D Computer Aided Design (CAD) program.
Solid Edge allows you to take hand sketches and turn them into professional drawings.
The draft environment will produce 2D drawings.
Using the Ohm’s Law Lab from last week, draw one of the schematics in Solid Edge and show it to me. Each person in the group has to draw one.
I will check your name off the paper when you have completed the schematic. Be sure to turn in the paper when everyone is done.

34. Pre-Class Tuesday
At the recent web developer's bowling match, two games were played. Kev beat Stuart in both games, also Richard beat John in both games. The winner in game 1 came second in game 2. Richard won game 2 and John beat Stuart in game 1. No player got the same placing twice. Can you determine who finished where in each game?
Name     #1  #2 Kev       1   2 Richard   2   1 John      3   4 Stuart    4   3

35. Pre-class Wednesday 3-30-11
A 1.5 Volt battery is connected to a small light bulb with a resistance of 9 W. What is the current in and power used by the bulb?
V=IR
I = V/R = 1.5 / 9 = 1/6 or Amps
P=IV
P = I V = x 1.5 = 0.25 Watts

36. Write: “Finishing performance test.”
Pre-class Thursday
Write: “Finishing performance test.”

37. Pre-Class Thursday
If 5 cats can catch 5 rats in 5 minutes, how many cats do you need to catch 100 rats in 100 minutes? 5

38. Guest Speaker: Adam Panagos
Pre-class Thursday
Guest Speaker: Adam Panagos

39. If p were a shape, what shape would it be?
Pre-Class Friday
If p were a shape, what shape would it be?
Happy p Day!

40. Pre-class Friday 10-23-09 Write: “Finishing performance test.”
Don’t forget to turn in your pre-classes for the week.