Physics
Grade-9
Easy
Question
Old turntables and record players used which electrical source to make music? Hint: the needle used to be a crystal.
- Thermoelectric
- Piezoelectric
- Magnetomotive
- Chemical reaction
Hint:
When a piezoelectric material is compressed, electricity is generated. It happens when mechanical or kinetic energy is transformed into electrical energy as a result of crystal deformation.
The correct answer is: Piezoelectric
The old turntables and record players convert the sound vibrations into electrical signals by the piezoelectric effect.
- The ability to convert mechanical energy to the electrical signals of certain materials is called piezoelectricity.
- The turntables and record players use the mechanism of piezoelectricity and convert the sound vibrations into electrical signals.
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