ELECTROMAGNETIC EFFECTS
The electric circuit has created a magnetic field.This effect can be used to produce movement,for example in electric motors, relays and other devices.
The scientist Michael Farady discovered the opposite effect.He noticed that electricity could be generated by using a magnet and an electrical conductor.This principle allows us to build dynamos and alternators.
To generate an electric current with a magnet, we can move the conductor or we can move the magnet.
SOUND
We can transform electric current into sound by using electromechanical devices, such as bells and buzzers. Some of these devices are based on the piezoeletric effect, or the ability of some materials to change shape when electricity is applied to them.
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