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Look in a dictionary for Amplifier. It increases the voltage or current of a signal.
The output voltage and current from a microphone are very low so a preamplifier is used to increase its voltage and current to be used for feeding a power amplifier.
Phe power amplifier also increases the voltage of the signal and increases the current enough to drive the very low impedance of a speaker.
 
dont come to learn basic electronics here, try in other groups. also there are millions of materials on net to learn. if you have problem related to any project its appriciated.
 
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