in this video I'm going to explain how
an automotive horn worked when I was
younger I was always fascinated with
horns and I was amazed at how this
little contraption depicted to the palm
of your hand can make all of that noise
the Horner's that would be mounted at
the front of the car like this there are
often two horns on most cars and it
bolts to the body of the frame and
there's a single wire usually the plugs
into the horn that provides power for
the horn let's take a look at how this
one works on the inside now it makes all
that noise the horn actually makes noise
when this metal diaphragm right here
flexes and vibrates and it vibrates or
moves based on the principle of
electromagnetism so those an
electromagnet right here when current
flows through this coil becomes an
energized electromagnet and I pulled
this plunger inward and pull the plunger
inward and pulled the background with it
so let's take a look at this in action
first the switch with those which will
cause current to flow through the
electromagnet energized the
electromagnet which will cause the
plunger of the diaphragm to pull inward
and also will cause the contacts to open
which interrupts the flow of current to
the electromagnet allows the plunger and
diaphragm to return back into original
position this process of the circuit
opening and closing and the diaphragm
moving in and out over and over again
repeats itself the diaphragm flex goes
back and forth and vibrates and very
high frequently creating the noise that
we hear from the horn
next let's look at the housing of the
horn which is usually made out of
plastic and is shaped a little bit like
a megaphone in fact it works a lot like
a megaphone or like a trumpet and then
it concentrates the sound waves and
increasing the amplitude sound waves to
make them louder the diaphragm inside
the horn vibrates and create sound waves
and those sound waves
typically would propagate in all
directions but because of the shape of
the megaphone it concentrates the sound
waves as they expand it controls the
expansion which amplifies the ways and
makes the sound louder
the horn a typical horn to produce sound
approximately 100 to 110 decibels which
is important so that other drivers and
other cars can hear the sound of the
horn even with the windows rolled up
with the sound of the traffic or the
radio or whatever other noises they have
that would be distracting them so
knowledge but quickly at a typical wire
diagram for a horn to see here there are
few horns and the horns of Granada's at
the body of the car and they receive the
power through a fuse and a relay the
relay is important because horses took
quite a bit of current maybe 5 to 10
amps a piece and then the relay is
turned on are controlled by the horn
switch which is in the steering wheel
when that wire goes to the clock screen
which allows the steering wheel to turn
without raising the wires so now that
the horn is installed back into the
vehicle we can connect the power wire
and we can see that the horn is grounded
by being both of the ear to the body on
the car the reason that there are two
horns on most cars is that each horn
produces a different tone and the
combined tones of a two horns are
supposed to be easier to hear the horns
off will just sound better and I think
it increases the perceived value of the
car versus the car just has one horn how
horns work I hope that helps you to be
able to understand and diagnose and
repair problems with your own phone