![Page 1: 22.2 Alternating Current, Generators and Motors pp. 803 - 813 Mr. Richter](https://reader035.vdocuments.mx/reader035/viewer/2022062516/56649dba5503460f94aab725/html5/thumbnails/1.jpg)
22.2 Alternating Current, Generators and Motorspp. 803 - 813
Mr. Richter
![Page 2: 22.2 Alternating Current, Generators and Motors pp. 803 - 813 Mr. Richter](https://reader035.vdocuments.mx/reader035/viewer/2022062516/56649dba5503460f94aab725/html5/thumbnails/2.jpg)
Agenda
Warm-Up
Review HW
Notes: Generators Alternating Current Motors
![Page 3: 22.2 Alternating Current, Generators and Motors pp. 803 - 813 Mr. Richter](https://reader035.vdocuments.mx/reader035/viewer/2022062516/56649dba5503460f94aab725/html5/thumbnails/3.jpg)
Objectives: We Will Be Able To…
Describe how generators produce alternating current.
Describe rms current and voltage in AC circuits.
Compare and contrast electric generators to electric motors.
![Page 4: 22.2 Alternating Current, Generators and Motors pp. 803 - 813 Mr. Richter](https://reader035.vdocuments.mx/reader035/viewer/2022062516/56649dba5503460f94aab725/html5/thumbnails/4.jpg)
Warm-Up:
Imagine you have a disk with magnets around the outside that alternate north and south poles ( like the one at the front of the classroom). How could you use a magnet to make the disk spin?
Discuss at your table, and we will discuss as a class in a few minutes.
![Page 5: 22.2 Alternating Current, Generators and Motors pp. 803 - 813 Mr. Richter](https://reader035.vdocuments.mx/reader035/viewer/2022062516/56649dba5503460f94aab725/html5/thumbnails/5.jpg)
Generators and Alternating Current
![Page 6: 22.2 Alternating Current, Generators and Motors pp. 803 - 813 Mr. Richter](https://reader035.vdocuments.mx/reader035/viewer/2022062516/56649dba5503460f94aab725/html5/thumbnails/6.jpg)
Generators and Alternating Current
A generator is a device that uses induction to convert mechanical energy into electrical energy.
![Page 7: 22.2 Alternating Current, Generators and Motors pp. 803 - 813 Mr. Richter](https://reader035.vdocuments.mx/reader035/viewer/2022062516/56649dba5503460f94aab725/html5/thumbnails/7.jpg)
Generators and Alternating Current
The rotation of the turbine (fan) rotates a wire loop in a magnetic field, inducing current.
Because the orientation of the loop keeps changing, the current alternates.
![Page 8: 22.2 Alternating Current, Generators and Motors pp. 803 - 813 Mr. Richter](https://reader035.vdocuments.mx/reader035/viewer/2022062516/56649dba5503460f94aab725/html5/thumbnails/8.jpg)
Generators and Alternating Current
The alternating current produces an alternating voltage as well.
For simplicity, we discuss the rms voltage and current. rms = “root mean
squared”
RMS is the average distance from zero.
![Page 9: 22.2 Alternating Current, Generators and Motors pp. 803 - 813 Mr. Richter](https://reader035.vdocuments.mx/reader035/viewer/2022062516/56649dba5503460f94aab725/html5/thumbnails/9.jpg)
Generators and Alternating Current
For example:
The peak voltage (highest value) from a standard electrical outlet is about 170 V.
However, we usually only consider the rmf value of 120 V.
![Page 10: 22.2 Alternating Current, Generators and Motors pp. 803 - 813 Mr. Richter](https://reader035.vdocuments.mx/reader035/viewer/2022062516/56649dba5503460f94aab725/html5/thumbnails/10.jpg)
Motors
![Page 11: 22.2 Alternating Current, Generators and Motors pp. 803 - 813 Mr. Richter](https://reader035.vdocuments.mx/reader035/viewer/2022062516/56649dba5503460f94aab725/html5/thumbnails/11.jpg)
Motors
An electric motor is a device that that uses magnetism to convert electrical energy into mechanical energy.
Usually the mechanical energy is in the form of a moving rotor, a rotating disk with alternating N-S magnets.
![Page 12: 22.2 Alternating Current, Generators and Motors pp. 803 - 813 Mr. Richter](https://reader035.vdocuments.mx/reader035/viewer/2022062516/56649dba5503460f94aab725/html5/thumbnails/12.jpg)
Motors
A wire uses alternating current to repeated switch the poles of an electromagnet.
The electromagnet alternately attracts and repels the magnets of the rotor.
![Page 13: 22.2 Alternating Current, Generators and Motors pp. 803 - 813 Mr. Richter](https://reader035.vdocuments.mx/reader035/viewer/2022062516/56649dba5503460f94aab725/html5/thumbnails/13.jpg)
Generators and Motors
Generators: Motors:
Mechanical Energy
Spin Wire in Magnetic Field
Induce Current
Electrical Energy
Electrical Energy
Alternate Current in a Wire
Attract/Repel Magnets
Mechanical Energy
![Page 14: 22.2 Alternating Current, Generators and Motors pp. 803 - 813 Mr. Richter](https://reader035.vdocuments.mx/reader035/viewer/2022062516/56649dba5503460f94aab725/html5/thumbnails/14.jpg)
Wrap-Up: Did we meet our objectives?
Describe how generators produce alternating current.
Describe rms current and voltage in AC circuits.
Compare and contrast electric generators to electric motors
![Page 15: 22.2 Alternating Current, Generators and Motors pp. 803 - 813 Mr. Richter](https://reader035.vdocuments.mx/reader035/viewer/2022062516/56649dba5503460f94aab725/html5/thumbnails/15.jpg)
Homework
p. 822 # 13, 14, 22
Write 2-3 complete sentences explaining the basic operation of an electric motor.