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March 12, 2008 DRILL 1. What does the following schematic symbol represent? DC Power Supply 2. What does the following schematic symbol represent? AC Power Supply 3. 4. How many volts are typical in a residential electrical outlet? 120 volts What do graphs of DC and AC power sources look like? Why? U3e-L8 Direct Current • If voltage is constantly 1.5 V, what does its graph over time look like? 2 1 Voltage (volts) 3 1.5 V 0 2 4 6 8 10 12 14 Time (seconds) U3e-L8 Alternating Current 0 120 +/-120 V -120 Voltage (volts) • If voltage is alternating 120 V to -120 V, what does its graph over time look like? 0 2 4 6 8 10 12 14 Time (seconds) U3e-L8 Electric Motors • Michael Faraday (1791-1867) – London, England. – Physicist and Chemist • First person to successfully create an electric motor. • Discovered that electric currents create a magnetic field, and vice versa. U3e-L8 Purpose of Lesson • • • To draft and model a simple electric motor that will spin in response to 9 volts of Direct Current. To demonstrate the principle of electromagnetism. To use principles of electromagnetism to produce a mechanical result. Motor Design, Design Drawings, and Lesson Courtesy of Fred Nastvogel [email protected] U3e-L8 Orthogonal Views of Product SKETCH and LABEL Motor Design, Design Drawings, and Lesson Courtesy of Fred Nastvogel [email protected] Orthogonal Views of Product SKETCH and LABEL Motor Design, Design Drawings, and Lesson U3e-L8 Courtesy of Fred Nastvogel [email protected] CLASSWORK Motor Design, Design Drawings, and Lesson Courtesy of Fred Nastvogel [email protected] • Draft the given shapes on paper. • Be precise with your measurements and your drawings. 1 DRAWING 2 DRAWINGS 1 DRAWING of EACH