Loudspeaker

High school (ages 12+)
Science & Technology

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/loudspeaker

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the scientific principle?Electromagnetic force acting on a current-carrying coil within a magnetic field
2. What is the key technological milestone?Development of the practical dynamic loudspeaker in the 1920s
3. What is a loudspeaker and how does it make sound?A loudspeaker turns electricity into sound by moving a small cone with a coil in a magnet. The coil moves when electric current changes, pushing air to make sound waves.
4. Who invented the first good loudspeaker and when?Chester Rice and Edward Kellogg invented the dynamic loudspeaker in the 1920s, using magnets and a coil to turn electricity into sound.

Transducer: A device that converts one form of energy into another, such as electrical to acoustic energy.
Lorentz Force: The force experienced by a charged particle moving in an electromagnetic field.
Acoustic Impedance: A measure of the opposition a system presents to the flow of acoustic energy.