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1 Important notes for this presentation: At the end of the presentation are four slides (# s 63-66)explaining how to use simple math to calculate the speed of the cars, given a few parameters, like the motor speed, wheel diameter, and gear ratio. The star and circle symbols are hyperlinks to the appropriate slides, Use the blue star (slide 50) to go to the animation, then the red star to return to slide 50. Complete clicking on slide 50, then, when finished, click the green circle to go to slide 52. 5/2/2016 V5.2 AZ Science Lab 1
2 HERE COMES THE SUN A STUDY OF ENERGY, ELECTRICITY AND PHOTOVOLTAICS/SOLAR CELLS Institute Of Electrical And Electronic Engineers, Phoenix Section Teacher In Service Program / Engineers In The Classroom (TISP/EIC) Helping Students Transfer What Is Learned In The Classroom To The World Beyond
3 Research Sources This presentation includes material from the following web sites: HowStuffWorks: How Solar Cells Work, Explain that stuff! Solar Cells Wikipedia, Tennessee Valley Authority, Coal-Fired Power Plant, The Electricity Book, k1/index.htm 5/2/2016 V5.2 AZ Science Lab 3
4 Our Sponsors The AZ Science Lab is supported through very generous donations from corporations, nonprofit organizations, and individual donations. Our sponsors include: 5/2/2016 V5.2 AZ Science Lab 4
5 Workshop Objectives Learn what an engineer does Discuss the Sun as a great energy source Investigate solar cells and their uses Learn a bit about electricity Engineer and build a solar car Have fun while learning!!! 5/2/2016 V5.2 AZ Science Lab 5
6 The Solar Model Car You Will Build Motor Solar Panel Foam Spacer Rear Wheel Axle with Gear Assembly Front Wheel Axle Assembly 5/2/2016 V5.2 AZ Science Lab 6
7 ENERGY What is it? Energy is the ability to do work. Can you name some common forms of energy? 5/2/2016 V5.2 AZ Science Lab 7
8 Properties of Energy The Law of the Conservation of Energy Energy can be neither created nor destroyed, but can change form. Energy forms can be converted Chemical to mechanical: car engine Potential (gravity) to kinetic: roller coaster Chemical to light/heat: burn a candle 5/2/2016 V5.2 AZ Science Lab 8
9 What is the only* source of energy on earth? * Except nuclear 5/2/2016 V5.2 AZ Science Lab 9
10 The Sun Our energy source past, present, and future! 5/2/2016 V5.2 AZ Science Lab 10
11 What Is The Sun? The Sun is the STAR at the center of our Solar System The Sun has a diameter of about 1,392,000 kilometers (865,000 mi). By itself accounts for about 99.86% of the Solar System's mass 1,300,000 Earths 27,000,000 F Center 10,000 F Surface 5/2/2016 V AZ Science Lab
12 5/2/2016 V5.2 AZ Science Lab 12
13 Solar Energy From 400 Million Years Ago Coal, petroleum and natural gas formed from buried plant life The sunlight is transformed through photosynthesis Sunlight Photosynthesis Plant Life Cycle Carbon Based Compounds Heat, Pressure & Time They are carbon-based fossil fuels These are often referred to as "buried sunshine How do we convert this energy into useful work? 5/2/2016 V5.2 AZ Science Lab 13
14 Forms of Energy Chemical Wind ELECTRICITY Water Solar 5/2/2016 V5.2 AZ Science Lab 14
15 Electricity: How Do We Make It? It is a conversion from other forms of energy: Chemical energy into electricity: batteries Mechanical energy into electricity: electric generators Light energy into electricity: solar panels (photovoltaic effect) 5/2/2016 V5.2 AZ Science Lab 15
16 Electricity: How Do We Make It? It is a conversion from other forms of energy Chemical energy into heat energy (burn coal, oil, natural gas) Heat energy into mechanical energy (turn turbine) Mechanical energy into electricity (turn electric generator) 5/2/2016 V5.2 AZ Science Lab 16
17 A CLEANER WAY TO PRODUCE ELECTRICITY Molten Salt Very Hot Air AC OUT Hot Air Out 5/2/2016 V5.2 AZ Science Lab 17
18 A SIMPLE WAY TO PRODUCE ELECTRICITY AC OUT No Turbines/Generators! 5/2/2016 V5.2 AZ Science Lab 18
19 The Problem with Electricity Electricity is a form of energy that is very hard to store, but we can convert it to chemical energy in a battery, and then re-convert it back to electricity! Energy can be neither created nor destroyed, but can change form. Inverter Chevy Volt Battery Pack 5/2/2016 V5.2 AZ Science Lab 19
20 Electric Cars Chevrolet Volt Nissan Leaf Tesla Model S 5/2/2016 V5.2 AZ Science Lab 20
21 Solar Power and Houses 5/2/2016 V5.2 AZ Science Lab 21
22 Residential Solar System 5/2/2016 V5.2 AZ Science Lab 22
23 Let s Look at a Home Solar System! 5/2/2016 V5.2 AZ Science Lab 23
24 What Is Electricity And What Are It s Properties? Two Forms: 1. Static Electricity 2. Current Electricity AZ Science Lab 5/2/2016 V5.2 24
25 What Is Electricity And What Are It s Properties? Electricity is the flow of electrons This occurs best when the material is made up of atoms with free outer electrons Hydrogen Atom Copper Atom 29 electrons /2/2016 V5.2 AZ Science Lab 25
26 The movement of free electrons forms an electric current An Electric Circuit is a path through which electricity flows 5/2/2016 V5.2 AZ Science Lab 26
27 How do we measure electricity? Billions and billions per second Characteristics of electric flow: Amperage quantity (amount) of electricity flowing Voltage pressure (push force) of the electricity Watts Power of the electricity: W = A * V 27
28 We measure electricity using a calibrated meter An electric multimeter (voltmeter, ammeter): 5/2/2016 V5.2 AZ Science Lab 28
29 5/2/2016 V5.2 Electrical Nature of Matter Materials that permit the motion of free electrons are called Conductors. Materials that oppose the motion of electrons are called Insulators Conductors are said to have low resistance while insulators have high resistance CONDUCTORS Silver Copper Gold Aluminum Brass Zinc Iron AZ Science Lab INSULATORS Dry Air Glass Mica Rubber Asbestos Bakelite PVC Teflon Plastics 29
30 Non Connected Electrical Circuit 5/2/2016 V5.2 AZ Science Lab 30
31 Connected Electrical Circuit 5/2/2016 V5.2 AZ Science Lab 31
32 5/2/2016 V5.2 AZ Science Lab 32
33 How to connect circuits Connecting Loads (resistors) Series Circuit 5/2/2016 V5.2 AZ Science Lab 33
34 How to connect circuits Connecting Loads (resistors) Parallel Circuit 5/2/2016 V5.2 AZ Science Lab 34
35 How to connect circuits Connecting Loads (resistors) Series Circuit Parallel Circuit 5/2/2016 V5.2 AZ Science Lab 35
36 Circuits 5/2/2016 V5.2 AZ Science Lab 36
37 How to connect circuits Connecting Sources (batteries) 1.5V 3.0V 1.5V 0.8A 0.8A Series Circuit Power = Voltage Current Parallel Circuit 1.5V 0.4A 0.2A 0.2A 5/2/2016 V5.2 AZ Science Lab 37
38 Applying the Series/Parallel Concept to the Solar Car 3.0V 0.33A 0.33A Series Circuit Speed 17,629 RPM Torque 1.6 gm-cm Won't Start! Power = Voltage Current Parallel Circuit 1.5V 0.66A Speed 6,990 RPM Torque 6.0 gm-cm 0.33A 0.33A 5/2/2016 V5.2 AZ Science Lab 38
39 Creating and Connecting Circuits Using a Breadboard 5/2/2016 V5.2 AZ Science Lab 39
40 5/2/2016 AZ 40 Science V5.2 Lab Name: Circuits Worksheet Circuit Very Bright Bright Dim + a a b b 1 Battery, 1 light bulb - a b 2 Batteries in series, 1 light bulb a b
41 1 Battery, 1 Lightbulb Current Schematic Diagram Battery Switch Lamp 5/2/2016 V5.2 AZ Science Lab 41
42 2 Batteries, 1 Lightbulb /2/2016 V5.2 AZ Science Lab 42
43 Types of Electricity Alternating Current - AC Batteries Direct Current - DC Dry Cells Wet Cells Solar Cells 5/2/2016 V5.2 AZ Science Lab 43
44 Direct Current Sources Batteries produce Direct Current (DC) Batteries produce electricity from a chemical reaction. Solar Cells produce electricity directly from light! 5/2/2016 V5.2 AZ Science Lab 44
45 What Is A Solar Cell? It converts the energy of sunlight directly into electricity A Solar Cell is also known as a Photovoltaic (PV) Cell Photovoltaic combination of 2 Greek words Photo Light Voltaic Electric or Voltage 5/2/2016 V5.2 AZ Science Lab 45
46 How Do Solar Cells Work? 1. When sunlight shines on the cell, photons (light particles) bombard the upper surface. 2. The photons carry their energy down through the cell. 3. The photons give up their energy to electrons in the lower, p-type layer. Two layers of doped silicon material sandwiched together: Other elements are added to silicon so that: N-type material has excess of electrons P-type material has holes, deficient in electrons The electrons use this energy to jump across the barrier into the upper, n-type layer and escape out into the circuit. 5. Flowing around the circuit, the electrons make the lamp light up. 2 Deficient electrons Excess electrons /2/2016 V5.2 AZ Science Lab 46
47 Discoverer of the Photoelectric Principle Albert Einstein explained the photoelectric effect in 1905 for which he received the Nobel prize in Physics in 1921 He was 26 years old! Albert Einstein /2/2016 V5.2 AZ Science Lab 47
48 Powering the International Space Station 5/2/2016 V5.2 AZ Science Lab 48
49 Solar Powered Airplane! 5/2/2016 V5.2 AZ Science Lab 49
50 Solar Powered Cars A solar car is an electric car powered by solar panels Solar vehicles are primarily demonstration vehicles. 5/2/2016 V5.2 AZ Science Lab 50
51 Engineering Our Solar Car Design Criteria: 5 mph within.5 sec from standing start Engineering Design: 1. Weight of car -> Force required -> Torque required 2. Motor RPM/Torque -> Gear ratio -> RPM/Torque at axle 3. RPM of the axle - > Wheel size -> Speed (velocity) of car 4. Motor -> Electric power required - > Voltage & Current 5. Voltage & Current - > Number of Solar Panels -> Weight 6. Back to #1 5/2/2016 V5.2 AZ Science Lab 51
52 Let s Build The Chassis Use foam board or corrugated plastic for the chassis. Cut the straw length a little wider than the chassis, but slightly less than the axle length.. Assemble the wheels and gears on the axles with the axles through straws, but leave a little slack between the wheels. Make sure the axles are parallel. Tape the straws firmly to the chassis; Taping the straws to the ends of the chassis is the best way to get parallel wheels. Clip the motor to the chassis on top of the chassis, NOT underneath the chassis (it will rub on the ground otherwise) and align the gears so they mesh, but not too tightly. 5/2/2016 V5.2 AZ Science Lab 52
53 Let s Add the Solar Power Solar Panel 1. Handle the solar panels gently; they are fragile! DON T bend or cut them! 2. Keep the car as light weight as possible 3. Reverse the wires if the car runs backwards 5/2/2016 V5.2 AZ Science Lab 53
54 Let's Race! 5/2/2016 V5.2 AZ Science Lab 54
55 What did we learn today? We explored the science, engineering, and technology of Electricity and Solar Energy All of the energy on earth comes from the sun* How solar cells work Electricity is the flow of electrons Series and Parallel circuits Use math to design machines *(except nuclear) 5/2/2016 V5.2 AZ Science Lab 55
56 Careers in STEM 5/2/2016 V5.2 AZ Science Lab 56
57 Careers in Science and Engineering You must find your passion Financially and socially rewarding Continuous learning and training (education) Maybe even be another Albert Einstein! 5/2/2016 V5.2 AZ Science Lab 57
58 Have Fun Today? Check out our website: click on the For Students tab! Thanks for coming and exploring with us the world of electricity and solar energy! 5/2/2016 V5.2 AZ Science Lab 58
59 APPENDIX 5/2/2016 V5.2 AZ Science Lab 59
60 Does the speed of the car depend on the size of the wheels? Calculate the speed of a solar car with 1 inch diameter wheels, and a 4:1 gear ratio, using a 1.5 volt Mabuchi motor.
61 Problem: Calculate the speed of a solar car with 1 inch diameter wheels, and a 4:1 gear ratio, using a 1.5 volt Mabuchi motor. Car Speed - mph Wheel Speed - RPM Mabuchi motor Specifications 5/2/2016 V5.2 AZ Science Lab 61
62 Calculate the speed of a solar car with 1 inch diameter wheels, and a 4:1 gear ratio, using a 1.5 volt Mabuchi motor. From the spec sheet, Motor speed = 6990 RPM, so Wheel speed = 6990/4 = 1747 RPM Now, for 1 inch dia. Wheels, circumference = π x 1 = π inches Look at this diagram So, we see that 1 revolution of a 1 wheel travels 3.14 Therefore, 1747rev/min travels 1747 x 3.14 = 5487 inches/min Now all we have to do is convert inches/min to miles/hours 5487 inches/min x 60 min./1 hour = 329,229 inches/hour 329,229 in/hr x 1 foot/12 in. x 1 mile/5,280 feet = 5.19 miles/hour Our car will travel at approximately 5.2 mph! 5/2/2016 V5.2 AZ Science Lab 62
63 5/2/2016 V5.2 AZ Science Lab 63
64 Calculate the speed of a solar car with 1 inch diameter wheels, and a 4:1 gear ratio, using a 1.5 volt Mabuchi motor. 5/2/2016 V5.2 AZ Science Lab 64
65 5/2/2016 V5.2 AZ Science Lab 65
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