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Magnetism + Electromagnetism (Magnets (Only 3 elements are magnetic(Fe, Ni…
Magnetism + Electromagnetism
Magnets
Only 3 elements are magnetic(Fe, Ni, Co)
are used to make permanent magnet
Magnets attract other magnetic materials
only permanent magnets can repel
Soft magnet only stay magnet while in a magnetic field
"The magnets are induced" when in a field
North -> South
Electromagnets
Use an electrical current to create a magnet
A coil(solenoid) produces the same field pattern as a bar magnet
Switch on/off
Make stronger by increasing current or more number of cells
Magnetic field - use Right Hand Drinking Rule
Motor effect
when put a current in a magnetic field it experiences a force
Flemming's Left Hand Rule
Application: motor/loud speakers
Generator effect
when the magnetic field changes around a conductor, a voltage is induced in the conductor
Transformers
change the voltage using 2 coils
V1/V2 = N1/N2
Power in = Power out
I1 x V1 - I2 x V2
Changing Current, has changing magnetic field(A.C. supply)
The iron core links this changing field with the secondary coil
An voltage is induced in the secondary circuit
if its a complete circuit => induced current
Used in a National Grid
Electromagnetic Induction