loud speaker help. (1 Viewer)

[100percent]

i have no idea how it works or what i need to know for it from the syllabus. help please? exam on friday

 

[Captain Gh3y]

In Loudspeakers, electrical signals are converted into sound. These signals are sent to a coil attached to the cone of the speaker. A permanent magnets surround the coil so that a magnetic field exists from the cone outwards. Since current carrying conductors experience a force in a magnetic field (motor effect), the force will be forwards or rearwards according to the direction of the current. The coil is attached to a paper diaphragm. The changing electrical current will cause the cone and hence the diaphragm to vibrate back and forth because they experience a force. This causes the air to be pushed back and forth producing sound that travels to the person’s ear. Turning up the volume will be a result of an increase in electric current, causing the cone to vibrate with greater force and produce higher amplitude.

Or, if you like, the syllabus asks for:

· Identify data sources, gather and process information to qualitatively describe the
application of the motor effect in:
- The galvanometer
- The Loudspeaker.

 

[Haku]

u get good diagrams and explaination in any text book.

good to draw a diagram for those kind of questions

 

[Captain Gh3y]

I'd advise against drawing a diagram if you're using a computer, you know.

It takes a while in paint.

 

[exa_boi87]

Isnt the central pole piece "south" and the top and bottom pieces "north" ?

edit: by the way, you have my respect .. drawing in paint .. I gave up on paint after the textboxes frustrated me

 

[100percent]

thank you very much captain
you explained it to me much more clearer than any text book i've seen.
many thanks and good luck on friday

 

[great_guns]

you all suck

sup champ.


ok LOUDSPEAKER

talk about motor effect, define motor effect (ME)
when current goes in one way the cone in the speaker goes up. (due to ME)
when you change the direction of the current, the cone goes down. (again ME)
the rapid change in current causes vibrations
= soundwaves
>>>>ears
= sound.