Question

Please I need a clear explanation and clear handwriting with explanaing this for me because I am realy confused and need help. Thanks in advance

My lab was about  Magnets and Magnetic fields. This is the question I need to answer for!

R3: Explain how a speaker works by explaining why each part is required. after that Summarize R3’s answer by explaining why the proffesor homemade earbud is so much superior to the one that you made.

Answer 1

When things shake about, or vibrate, they make the sounds.  If you thump a kettle-drum with a stick, you can see the tight drum skin moving up and down very quickly for some time afterward—pumping sound waves into the air. Loudspeakers work in a similar way.

Working:- At the front of a loudspeaker, there is a fabric, plastic, paper, or lightweight metal cone a diaphragm not unlike a drum skin (colored gray in our picture). The outer part of the cone is fastened to the outer part of the loudspeaker's circular metal rim. The inner part is fixed to an iron coil a.k.a the voice coil, (colored orange in the diagram) that sits just in front of a permanent magnet(sometimes called the field magnet, and colored yellow). When you hook up the loudspeaker to a stereo, electrical signals feed through the speaker cables (red) into the coil. This turns the coil into a temporary magnet or electromagnet. As the electricity flows back and forth in the cables, the electromagnet either attracts or repels the permanent magnet. This moves the coil back and forward, pulling and pushing the loudspeaker cone. Like a drum skin vibrating back and forth, the moving cone pumps sounds out into the air.

Different parts of a speaker:-

1. Diaphragm (cone): Moves in and out to push air and make sound.
2. Dust cap (dome): Protects the voice coil from dust and dirt.
3. Surround: A piece of elastic rubber, foam, or textile that flexibly fastens the diaphragm to the basket (outer frame).
4. Basket: The sturdy metal framework around which the speaker is built.
5. Spider (suspension): A flexible, corrugated support that holds the voice coil in place, while allowing it to move freely.
6. Magnet: Typically made from ferrite or powerful neodymium.
7. Bottom plate: Made of soft iron.
8. Pole piece: Concentrates the magnetic field produced by the voice coil.
9. Voice coil: The coil that moves the diaphragm back and forth.
10. Former: A cylinder of cardboard or other material onto which the coil is wound.
11. Top plate: Also made of soft iron.
12. Cables: Connect stereo amplifier unit to voice coil.