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Study Guide - Chapter 33-1
Study Guide - Chapter 33-1

... a magnetic field. This induced field obeys the following equation: * closed B † . L œ .! %! ...
Electromagnetic Induction
Electromagnetic Induction

... Back EMF in electric motors You may have noticed that when something like a refrigerator or an air conditioner first turns on in your house, the lights dim momentarily. This is because of the large current required to get the motor inside these machines up to operating speed. When the motors are tur ...
Physical Science - Pleasant Hill School District
Physical Science - Pleasant Hill School District

magnet - Science!
magnet - Science!

Electromagnetic Induction Notes
Electromagnetic Induction Notes

... • The most current will be produced in the material where the electrons are bound most loosely – i.e.) The magnet will produce a larger current when moving past copper than rubber ...
MAGNETIC FORCE
MAGNETIC FORCE

... When electric charges move it generates a magnetic field (you can make a magnet using electricity). ...
Name ANSWER KEY Date______________ Unit 11 Magnets
Name ANSWER KEY Date______________ Unit 11 Magnets

... 7. What are two ways you can increase the strength of an electromagnet? a. Add a bigger energy source b. Add more coils 8. Name the four types of magnet and choose two types to describe. a. Ferromagnet - magnets made of iron, nickel, cobalt or mixtures of these materials b. Electromagnet - magnets m ...
Electricity Distribution
Electricity Distribution

... The voltage induced in the secondary (output) coil depends on the number of turns on the primary and secondary coils. ...
CHAPTER 18 - QUESTIONS 1-3
CHAPTER 18 - QUESTIONS 1-3

... field. Poles like a compass needle, Spinning electrons cause movement ; magnetic field 5. If 2 magnets push each other away, what can you conclude about their poles? They carry the same charge. 6. Why are copper and aluminum not magnetic? Their atomic structure does not allow for it. ...
Magic Sand - studentorg
Magic Sand - studentorg

MAGNETIC INDUCTION AND FARADAY`S LAW
MAGNETIC INDUCTION AND FARADAY`S LAW

... How about minus sign? ...
Section F22: Electric Motors and Electromagnetic Induction
Section F22: Electric Motors and Electromagnetic Induction

Standard EPS Shell Presentation
Standard EPS Shell Presentation

... magnetic field. • By either moving the magnet or the wire, electricity is produced. • Ex: Generators-used to convert mechanical energy into electrical energy by ...
magnetic field - Rosehill
magnetic field - Rosehill

CHAPTER 3 QUIZ – ELECTROMAGNETISM
CHAPTER 3 QUIZ – ELECTROMAGNETISM

Lesson 2: Magnetism
Lesson 2: Magnetism

Magnetic Fields
Magnetic Fields

... • If magnetic monopoles existed, then magnetic field lines would begin and end on them. ...
Presentations
Presentations

... • Homework, laboratory, problem-solving in small groups to follow Special thanks: Gladding, Selen, Stelzer, Wiltfong ...
HSPS3-5
HSPS3-5

electromagnets - ScienceStLaurence
electromagnets - ScienceStLaurence

Home Work Solutions 10 F HG I KJFHGIKJ F HG I KJ F HGIKJ
Home Work Solutions 10 F HG I KJFHGIKJ F HG I KJ F HGIKJ

... case for resistances. Note that to ensure the independence of the voltage values, it is important that the inductors not be too close together (the related topic of mutual inductance is treated in Section 30-12). The requirement is that magnetic field lines from one inductor should not have signifi ...
Do now! - MrSimonPorter
Do now! - MrSimonPorter

Slide 1
Slide 1

Format: For each problem you must draw a diagram! detailing the
Format: For each problem you must draw a diagram! detailing the

... Format: For each problem you must draw a diagram! detailing the situation. Zero point will be given for a good answer without the proper derivation (intermediate steps). Write clearly and detail (very briefly) the logic of the steps that you are using. If I cannot understand what you are doing, you ...
Magnetism Notes
Magnetism Notes

< 1 ... 137 138 139 140 141 142 143 144 145 ... 153 >

Magnetic core

A magnetic core is a piece of magnetic material with a high permeability used to confine and guide magnetic fields in electrical, electromechanical and magnetic devices such as electromagnets, transformers, electric motors, generators, inductors, magnetic recording heads, and magnetic assemblies. It is made of ferromagnetic metal such as iron, or ferrimagnetic compounds such as ferrites. The high permeability, relative to the surrounding air, causes the magnetic field lines to be concentrated in the core material. The magnetic field is often created by a coil of wire around the core that carries a current. The presence of the core can increase the magnetic field of a coil by a factor of several thousand over what it would be without the core.The use of a magnetic core can enormously concentrate the strength and increase the effect of magnetic fields produced by electric currents and permanent magnets. The properties of a device will depend crucially on the following factors: the geometry of the magnetic core. the amount of air gap in the magnetic circuit. the properties of the core material (especially permeability and hysteresis). the operating temperature of the core. whether the core is laminated to reduce eddy currents.In many applications it is undesirable for the core to retain magnetization when the applied field is removed. This property, called hysteresis can cause energy losses in applications such as transformers. Therefore, 'soft' magnetic materials with low hysteresis, such as silicon steel, rather than the 'hard' magnetic materials used for permanent magnets, are usually used in cores.
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