Electromagnetic induction Electric currents generate magnetic fields

attractionlewdsterElectronics - Devices

Oct 18, 2013 (3 years and 9 months ago)

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1
Electromagnetic induction
Power generation
Power transmission
Transformers
Electric currents generate
magnetic fields

demonstration
2
Electric currents are pushed
on by magnetic fields

demonstration
Electric currents are generated
by magnetic fields
3
Electric currents from
magnetic fields

Requires
changing
changing
magnetic fields!

demonstration

What’s going on
here?
More coils = more current

demonstration
4
Electric motors convert electricity
to mechanical energy
electric motor
Electric generators convert
mechanical energy to electricity
Difference between AC and DC generators
5
Transformers!

Oops…
Transformers!

Used to change
voltage

Step up

Step down
6
Power transmission

W = V × A

Heat loss ∝ A
How it works
1.
Changing electric
fields in primary
coil generates
magnetic field
2.
Core concentrates
the magnetic field
3.
Magnetic field
induces current in
secondary coil
demonstration
7
How it works

Voltage change
proportional to
change in number
of coils

demonstration
Field induction summary

Changing electric
fields →magnetic
fields

demonstration

Changing magnetic
fields →electric
fields

What’s going on?