Transcript U3e L8 3-12 Electricity and Magnetism 1

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