ELECTRIC CURRENT

We can transform sound into electric current using
electromagnetical devices such us bells, some of these de
vicesare based on the piezoelectric effect

Michael Faraday noticed
that electricity could be
generated by using a magnet
anelectrical conductor this allows
us tu build dynamos and
alternators

INCASDECENT BULBS

electric current passes through
the metalic filament
of the bulb

FLUORESCENT BULBS

It has a metalic fillament, when
the electric current
passes through the filament electrons
are emited into the
inert gas

LIGHT-EMITTING DIODES

Has layers of semiconductor materials
when electricity is applied to the led
then the electrons cross over into the active layer

MOVEMENT OF ELECTRONS THROUGH AN ELECTRICAL CABLE IS SLOW AND DISORDERLY

JOULE EFFECT : E=I2 X R X t