Physics for IGCSE & O level - Magnets And Currents (Section 5 - No. 5)
What is the role of an amplifier in a loudspeaker system?
To convert sound waves to electrical signals.
To increase the power of the electrical signal.
To create a magnetic field.
To act as a magnet.
คำอธิบาย
An amplifier increases the power of the electrical signal sent to the loudspeaker.