56A Motors and Generators LIMITED LICENSE TO MODIFY. These PowerPoint slides may be modified only by teachers currently teaching the SEPUP course to customize the unit to match their students learning levels or to insert additional teaching aides. Modified slides may be used only by the modifying teacher in his or her classroom, or shared with other teachers of SEPUP within the teachers school district, with these same restrictions. Modified slides may not be taken out of the classroom or distributed to any non-student person or organization. Except for use with students in the classroom, modified slides may not be published in printed or electronic form, including posting on the Internet. Only text may be modified: photographs and illustrations on the slides may not be modified in any way except to change their size. DISCLAIMER OF WARRANTY. THE REGENTS OF THE UNIVERSITY OF CALIFORNIA (University) MAKE NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. University will not be liable for any costs, damages, fees or other liability, nor for any direct, indirect, special, incidental or consequential damages (including lost profits) with respect to any claims by the purchaser or user of SEPUP or any third party on account of or arising from the use or modifications to the slides. Client acknowledges and accepts that University services are provided on an as-is basis. Copyright 2015 The Regents of the University of California. All rights reserved. Header photo: Sam Howzit | Flickr Creative Commons Slide Design: Shaun Wegscheid | Fonts: Arial, Kalinga Title slide photo: Jean Scheijen | FreeImages.com 56A Motors and Generators Key Vocabulary motor generator electromagnetism 56A Motors and Generators Identify objects you have seen in the past week that are magnetic Record your list in your notebook. 56A Motors and Generators How do you know if something is magnetic? Share your thoughts with the class. 56A Motors and Generators Set up Set up the compass, bar magnets, and wire coil as your teacher instructs. Predict what will happen if the compass is moved close to the wire coil. 56A Motors and Generators Teacher demonstration What does the movement of the compass indicate? 56A Motors and Generators Read the introduction and look for key ideas Electric motors run many devices, both large and small. 56A Motors and Generators How can you make a motor spin faster? 56A Motors and Generators Complete procedure steps 1-4 56A Motors and Generators What do you think will happen when two magnets are placed close to one another? Share your thoughts with the class. 56A Motors and Generators Complete procedure steps 5-7 SCORING GUIDE: Designing Investigations 56A Motors and Generators Complete procedure steps 8-11 In a motor, a current creates a magnetic field, which interacts with another magnetic field to produce a spinning motion. Do you think this sequence could be reversed? 56A Motors and Generators Complete procedure step 12 56A Motors and Generators Analysis question 1 Electromagnetism refers to the magnetism that occurs when electric charges are in motion. What evidence did you observe for the existence of electromagnetism in this activity? 56A Motors and Generators Analysis question 2 What does an electric motor need in order to work? 56A Motors and Generators Analysis question 3 What does an electric generator need in order to work? 56A Motors and Generators Analysis question 4 Using evidence from your investigation, describe the variables that influence how fast a motor spins. 56A Motors and Generators Analysis question 5 Predict the variables that would affect the amount of electricity a generator generates. Explain the reasoning behind your prediction. 56A Motors and Generators SCORING GUIDE: Understanding Concepts 56A Motors and Generators What are the structural similarities of motors and generators? Share your thoughts with the class. 56A Motors and Generators How can you make a motor spin faster? 56A Motors and Generators Key vocabulary definitions Electric motor A device that converts electrical energy into mechanical energy. 56A Motors and Generators Key vocabulary definitions Generator - A machine for making electricity, generally by the circular movement of a turbine, driven by steam or water, connected to a magnet that revolves inside another magnet. When a magnet moves inside another magnet, an electric current results. This current can be transmitted for immediate use, or stored for later use. 56A Motors and Generators Key vocabulary definitions Electromagnetism - Magnetism associated with moving electrical charges. 56A Motors and Generators Design Design an experiment to investigate how changes to the coil affect how fast a motor spins.