iot poly engineering 3 28 feb 2011 speaker project
TRANSCRIPT
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IOT
POLY ENGINEERING3
28 Feb 2011Speaker Project
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IOT
POLY ENGINEERING3
Goals
1. To understand how speakers work and how the reverse process of turbines work to generate electricity
2. Apply the engineering design process3. Communicate results
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POLY ENGINEERING3
How Power Plants Work
1) Convert Potential Energy to Mechanical Energy
2) Convert Mechanical Energy to Electrical Energy
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POLY ENGINEERING3
How Speakers Work
1) Convert Electrical Energy to Magnetic Energy
2) Convert Magnetic Energy to Mechanical Energy
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POLY ENGINEERING3
How Speakers Work1) Electrical Energy is inputted by Audio
Device
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POLY ENGINEERING3
How Speakers Work2) Electricity passing through a wire creates a
magnet
- Increase the strength of the magnet by wrapping wire into coils.
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POLY ENGINEERING3
How Speakers Work
3) Electromagnet attracts or repels permanent magnet.
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POLY ENGINEERING3
How Speakers Work
4) One magnet is fixed and the other magnet is attached to a membrane. As electromagnet changes direction, membrane vibrates.
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POLY ENGINEERING3
How Speakers Work5) Vibrating membrane moves air
molecules. Air molecules collide with our ear drums and we hear sound.
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POLY ENGINEERING3
Supplies
1 square foot of cardboard1 neodymium magnet
4 feet of magnet wire
Paper plate
1 piece of construction paper
scissors glue
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POLY ENGINEERING3
Speaker Steps
1. Make electromagnet out of wire• -Slightly wider than magnet• -At least 6 inches of wire before and after coil• -Tightly wound
2. Make suspension system• Must support paper plate and allow it to vibrate
3. Connect coil to the center of the paper plate
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POLY ENGINEERING3
Speaker Steps
4. Connect magnet to cardboard
5. Connect suspension system to paper plate
6. Connect suspension system to cardboard
7. Test the Speaker
8. Redesign if speaker doesn’t work
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POLY ENGINEERING3
Assessment
Work with one partner
– Produce a working speaker that clearly plays music
– Produce a write up that details every step needed to make the speaker. Should be written so that a 3rd grader could make the speaker
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POLY ENGINEERING3
Supplies
• Provided with 1 magnet, 4 ft wire, paper, and cardboard
• Extra Supplies– $1 per magnet– $0.20 for every foot of wire