Name: Set: Date: Pliers SKU Go on your own scavenger hunt to find these items. Try creating with all kinds of materials!
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1 Name: Set: Date: Perfect for Grades: 5+ Difficulty: Intermediate The Lab Download Documents at teachergeek.com This lab can begin after you complete the basic mini turbine build. During this lab you will research rotor configurations and the effect they have on turbine voltage output. At the end of the lab you will devise and run your own experiment. For use with TeacherGeek Mini Wind Turbine Activity: (single) or (10 pack) 1. You ll need the Mini Wind Turbine you built from the TeacherGeek Build Guide. 2. Seven Skewer Sticks Time to break out those tools and start building! Remember to be kind and share with others. Multi-Cutter SKU Tools available at demco.com Screwdriver SKU Pliers SKU Multi-Meter SKU Alligator Clip Lead (Test Lead) SKU Go on your own scavenger hunt to find these items. Try creating with all kinds of materials! Tape Recycling Materials (for blades) Fan (for testing) Safety Goggles Page 1
2 Name: Set: Date: 1. Write the names of the components diagramed above: A. B. C. D. 2. Which of the following components is your turbine missing? (hub, tower, Gear Box, rotor, generator) Page 2
3 What is RPM? RPM = Revolutions per Minute (the number of times something rotates in a minute) 3. How many times can you spin your tubine rotor around in 30 seconds? Revolutions in 30 seconds: RPM: 4. If your turbine blades rotate 400 times in two minutes, what is the RPM of the blades? 5. What is the RPM of the seconds hand on a clock? 6. A fast mini turbine can spin at over 3500 RPM. How many times faster is that then the RPM at which you spun your turbine by hand? Show your work. Answer: Torque Torque is a twisting force. Some turbines use a gearbox to convert torque to additional RPM. Your mini turbine does not have a gearbox, so additional torque (more torque than it takes to spin the blades) will be lost. Page 3
4 7. Use the following words to properly fill in the blanks. Use every word: load sun rotational energy electrical generator The from the wind is converted into energy which turns the to produce energy. That energy is used to power a. Wind energy is created by uneven heating of the earth s surface by the. What can your mini turbine power? Your mini turbine doesn t produce enough electricity to light a bulb or run a motor (there are other TeacherGeek turbines that can). How will you measure the power it produces? It will produce plenty of power for a standard multi-meter to measure. Page 4
5 What is Voltage? Voltage is the potential energy that makes the electrical current flow (by pushing the electrons). The unit of voltage is shown as v. You will measure the voltage output by your turbine. Find out how below! (Without a Load) Set your multi-meter to measure m volts. Connect leads from the multi-meter to the terminals on your mini turbine. The multi-meter should display a voltage output when the turbine rotor is turned. Note: Without a load, the readings on your multi-meter many not be stable. See how to test your turbine with a load on the next page. Page 5
6 8. Voltage and RPM: Is there a correlation between RPM and Voltage? Spin your wind turbine with a finger and record your findings: Voltage at a low RPM (spinning slow): Voltage at a medium RPM: Voltage at a high RPM (spinning fast): 9. Describe the correlation between RPM and voltage: Load A load is the part of an electrical circuit that used the electricity. The load converts the electrical energy into another form of energy. Optional Testing: Testing Your Turbine with a Load The proper way to test your turbine is to measure voltage across a load. Use a load if your meter measurements jump around while you are trying to read them. The load can be a bulb, 2.7ohm resistor (SKU ), small dc motor, or even a pencil with both ends sharpened. Note: the bulb and motor with not light up/run, but they will still use some electrical energy to heat up. The same load should be used throughout the lab. Page 6
7 10. Measure and graph the peak voltage output of your turbine at the distances from the fan shown below. Voltage Output / Turbine Distance from Fan Output Voltage mv cm (20in) 75cm (30in) 100cm (40in) 125cm (50in) Turbine Distance frm Fan 11. Draw a line of best fit between your data points on the graph above. 12. Describe the correlation between voltage and turbine distance from the fan: Interpolate to estimate values of data between two known values 13. Using the graph above, interpolate the voltage output for the distances from the fan: 63.5cm (25in): 115m (45in): Page 7
8 Independent Variables variables you change in an experiments. Dependent Variables variables that change as a result of changes made to independent variables. 14. What was the independent variable for the question 11 experiment? 15. What was the dependent variable for the question 11 experiment? Changing Blade Pitch The pitch (angle) of blades can easily be changed by slightly loosening the hub screw so the skewer sticks can rotate, but not fall out. The screw can be retightened after all blades are adjusted to the proper angle. Measuring Blade Pitch The TeacherGeek protractor is the best way to easily measure blade angles. Here s how you use it: The red arrows show the most common angles used on mini wind turbines (0, 15, 30, 45, 60, 75, 90 ). 16. What is the pitch of the blade shown above? Page 8
9 Hypothesis a prediction of the effects of changing one variable or another. 17. Your hypothesis: How do you think changes in blade pitch will effect voltage output? 18. Measure and graph the peak voltage output of your turbine with the blades pitched to 0, 15, 30, 45, 60, 75 and 90. Use a TeacherGeek protractor to measure and set the blade pitch. Your turbine must be 50cm (20in) away from the fan for this experiment. Voltage Output / Blade Pitch Output Voltage mv Blade Angle 19. Draw a line of best fit to connect your data points on the graph above. Page 9
10 20. Was your hypothesis correct? Explain what the graph shows. 21. Is the relationship between blade pitch and voltage output linear or nonlinear? You need to figure out what linear and nonlinear mean. 22. Use the Voltage Output /Blade Pitch Graph to calculate the ideal blade angle for the highest voltage output: Interpolated (theoretical) blade pitch for highest voltage: 23. Adjust your turbine blades to the pitch provided for question 22. Test the wind turbine with configuration used for the Voltage Output /Blade Pitch experiment (50mm away from the fan). Show your teacher your turbine during testing. What is the voltage output? Teacher Signature: Voltage Produced: 24. What is the difference between the actual and calculated voltage? 25. What could cause the interpolated and actual voltage to be different? Page 10
11 It is now time for you to create your own experiment and share your findings with the class. Your experiment should test a single variable, such as: diameter of blades number of blades shape of blades mass of blades effect of load on voltage output Your experiment should: test a hypothesis follow the scientific process document all steps detail findings in a conclusion Your presentation should: last approximately 2 minutes be informative and entertaining document all aspects of your experiment Example Research the effects of blade diameter on voltage output. Create a hypothesis. Measure voltage output for different blade lengths (rotor diameters) by progressively cutting and testing the blades. Graph and interpret the data. Write a conclusion. Create a 2 minute presentation documenting your experiment and findings. Page 11
12 Experiment 15pts Did your experiment: test a hypothesis test a single variable follow the scientific process document all steps detail findings in a conclusion Presentation Delivery 10pts Did your presentation: last approximately 2 minutes document all aspects of the experiment Bonus 2pts Was your presentation incredibly unique, entertaining, informative and memorable? Lab Score: /25 Experiment & Presentation Score: (Lab Score + Experiment & Presentation Score) x 2 = Overall Score Overall Score Page 12
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