Loudspeaker © Siemens Stiftung 2018 CC BY-SA 4.0 international

Loudspeaker

Image

Photo:
The loudspeaker demonstrates the principle of electroacoustic sound transduction. See the video “Sound emission at the loudspeaker”.

English, German
Image (296.6 kByte)
2018-04-22
The pitch-frequent alternating current supplied by an amplifier flows through a coil in the loudspeaker. In so-called dynamic loudspeakers, this coil is in a ring-shaped permanent magnetic field. The coil is connected to a diaphragm. Through the passage of the alternating current, forces now begin to have an effect on the coil which is moved to and fro in time with the pitch frequency. The diaphragm is moved and transmits its vibration to the air, the sound is emitted.

Information and ideas:
The process of electroacoustic sound transduction can be explained very well to the students with the help of a technical device that is familiar to all of them. Furthermore, the production and propagation of sound waves – important in human physiology for hearing and speaking – can be shown.

Relevant for teaching:
Communication and understanding
Vibrations and waves
Acoustic phenomena
Example
Personal, social and health education (PSHE); Physics; Technology
Grade 1 to 4; Grade 5 to 6; Grade 7 to 9; Grade 10 to 13
Elementary school; Middle/high school; Vocational training
Electroacoustics; Sound
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© Siemens Stiftung 2018
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