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1975265
Magnetism and Electromagnestism
Description
Mind Map on Magnetism and Electromagnestism, created by Jaden Thorne on 06/02/2015.
Mind Map by
Jaden Thorne
, updated more than 1 year ago
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Created by
Jaden Thorne
over 9 years ago
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Resource summary
Magnetism and Electromagnestism
Properties of Magnetic Materials
Magnetic Materials
Ferromagnetic Materials
Easily Magnetized
Nickel, Iron, Cobalt, Manganese
Paramagnetic Materials
Can be magnetized but not easily
Platinum, Titanium, Chromium
Diamegnetic Materials
Cannot be magnetized
Lines of force go around
Copper, Brass, Antimony
Classification
Temporary
Domains only aligned when force applied
Force= another magnet or electric current
Force removed little to no magnetic effect
Permanent
Always have magnetic effect
Alloy Steel often used
Magnetic Poles
North Pole
Attracted to geographic North
South Pole
Attracted to geographic south
Field flows N to S
Like poles repel, opposite attract
Magnetism Terminology
Magnetic Flux
Flux Density
Permeability
Reluctance
Retentivity
Saturation
Electromagnetism
Magnetic Feild Direction
Left Hand Rule for Conductors
Magnetic Coil Polarity
Left Hand Rule for Coils
Factors Effecting Electromagnet Strength
Current
Turns
Type of Core
Hysteresis Loss, Eddy Currents, and Core Saturation
Hysteresis loss: Silicon Steel
Eddy Currents: Thin insulated sheets
Core saturation: domains are aligned
Induced Voltage
Faraday's Law of Induction
Fleming's Left-Hand Rule
Factors Affecting Induced Voltage
Flux Density
# of turns
Velocity and angle of cut
Electromagnetic Induction
Self-Induction
Change in current causes change in magnetic field inducing a voltage
Induced voltage opposes current
Lenz's Law of Induction
If an induced current flows, its direction is always such that it will oppose the change which produced it.
Inductance
Property that opposes change of current
Mutual Induction
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