Unit 14 Magnetic Induction. Objectives: Discuss magnetic induction. List factors that determine the...
-
Upload
cordelia-logan -
Category
Documents
-
view
221 -
download
0
Transcript of Unit 14 Magnetic Induction. Objectives: Discuss magnetic induction. List factors that determine the...
![Page 1: Unit 14 Magnetic Induction. Objectives: Discuss magnetic induction. List factors that determine the amount and polarity of an induced voltage. Discuss.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649e175503460f94b02a83/html5/thumbnails/1.jpg)
Unit 14Magnetic Induction
![Page 2: Unit 14 Magnetic Induction. Objectives: Discuss magnetic induction. List factors that determine the amount and polarity of an induced voltage. Discuss.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649e175503460f94b02a83/html5/thumbnails/2.jpg)
Unit 14 Magnetic Induction
Objectives:
• Discuss magnetic induction.
• List factors that determine the amount and polarity of an induced voltage.
• Discuss Lenz’s law.
• Review the formula for R-L time constants.
![Page 3: Unit 14 Magnetic Induction. Objectives: Discuss magnetic induction. List factors that determine the amount and polarity of an induced voltage. Discuss.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649e175503460f94b02a83/html5/thumbnails/3.jpg)
Unit 14 Magnetic Induction
Current flowing through a conductor produces a magnetic field around the conductor.
Current flowing out Current flowing in
![Page 4: Unit 14 Magnetic Induction. Objectives: Discuss magnetic induction. List factors that determine the amount and polarity of an induced voltage. Discuss.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649e175503460f94b02a83/html5/thumbnails/4.jpg)
Unit 14 Magnetic Induction
A voltage is induced when a conductor cuts magnetic lines
of flux.
![Page 5: Unit 14 Magnetic Induction. Objectives: Discuss magnetic induction. List factors that determine the amount and polarity of an induced voltage. Discuss.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649e175503460f94b02a83/html5/thumbnails/5.jpg)
Unit 14 Magnetic Induction
Reversing the direction of movement reverses the polarity of the voltage.
![Page 6: Unit 14 Magnetic Induction. Objectives: Discuss magnetic induction. List factors that determine the amount and polarity of an induced voltage. Discuss.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649e175503460f94b02a83/html5/thumbnails/6.jpg)
Unit 14 Magnetic Induction
Reversing the polarity of the magnetic field reverses the polarity of the voltage.
![Page 7: Unit 14 Magnetic Induction. Objectives: Discuss magnetic induction. List factors that determine the amount and polarity of an induced voltage. Discuss.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649e175503460f94b02a83/html5/thumbnails/7.jpg)
Unit 14 Magnetic Induction
Left-hand generator rule.
![Page 8: Unit 14 Magnetic Induction. Objectives: Discuss magnetic induction. List factors that determine the amount and polarity of an induced voltage. Discuss.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649e175503460f94b02a83/html5/thumbnails/8.jpg)
Unit 14 Magnetic Induction
Voltage is induced by a moving magnetic field.
![Page 9: Unit 14 Magnetic Induction. Objectives: Discuss magnetic induction. List factors that determine the amount and polarity of an induced voltage. Discuss.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649e175503460f94b02a83/html5/thumbnails/9.jpg)
Unit 14 Magnetic Induction
A single-loop generator.
![Page 10: Unit 14 Magnetic Induction. Objectives: Discuss magnetic induction. List factors that determine the amount and polarity of an induced voltage. Discuss.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649e175503460f94b02a83/html5/thumbnails/10.jpg)
Unit 14 Magnetic Induction
Increasing the number of turns increases the induced voltage.
![Page 11: Unit 14 Magnetic Induction. Objectives: Discuss magnetic induction. List factors that determine the amount and polarity of an induced voltage. Discuss.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649e175503460f94b02a83/html5/thumbnails/11.jpg)
Unit 14 Magnetic Induction
Lenz’s LawAn induced voltage or current opposes the
motion that causes it.
Please note:Inductors always oppose a change of current!
![Page 12: Unit 14 Magnetic Induction. Objectives: Discuss magnetic induction. List factors that determine the amount and polarity of an induced voltage. Discuss.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649e175503460f94b02a83/html5/thumbnails/12.jpg)
Unit 14 Magnetic Induction
Inductance is determined by the physical construction of the coil.
![Page 13: Unit 14 Magnetic Induction. Objectives: Discuss magnetic induction. List factors that determine the amount and polarity of an induced voltage. Discuss.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649e175503460f94b02a83/html5/thumbnails/13.jpg)
Unit 14 Magnetic Induction
R-L Time ConstantsT = L / R
T = time in secondsL = inductance in henrysR = resistance in ohms
This formula describes the time necessary for current in an inductor to reach its full Ohm’s law value.
![Page 14: Unit 14 Magnetic Induction. Objectives: Discuss magnetic induction. List factors that determine the amount and polarity of an induced voltage. Discuss.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649e175503460f94b02a83/html5/thumbnails/14.jpg)
Unit 14 Magnetic InductionReview:
1. When current flows, a magnetic field is created around the conductor.
2. When a conductor is cut by a magnetic field, a voltage is induced in the conductor.
3. The polarity of the induced voltage is determined by the polarity of the magnetic field.
![Page 15: Unit 14 Magnetic Induction. Objectives: Discuss magnetic induction. List factors that determine the amount and polarity of an induced voltage. Discuss.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649e175503460f94b02a83/html5/thumbnails/15.jpg)
Unit 14 Magnetic Induction
Review:
4. Three factors that determine the amount of induced voltage are:
a. the number of turns of wire.b. the strength of the magnetic field.c. the speed of the magnetic flux cutting
action.
![Page 16: Unit 14 Magnetic Induction. Objectives: Discuss magnetic induction. List factors that determine the amount and polarity of an induced voltage. Discuss.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649e175503460f94b02a83/html5/thumbnails/16.jpg)
Unit 14 Magnetic Induction
Review:
5. Induced voltage is always opposite in polarity to the applied voltage.
6. Inductors oppose a change of current.7. Inductance is measured in units called
henrys (H).8. Iron core inductors are wound on cores
of magnetic material.