How transistors amplify audio signals in megaphone circuit?

Microphone + Speaker = Megaphone This is most simple definition of content inside this video. in this video you will learn how transistors amplify voltage and current and how to bias a transistor to do amaizing things for you. This video will expand your analog vision. Link to Current Amplifier Video    • Single transistor DC motor speed controller!   Link to CFL bulb video    • Motion Detector without PIR module! Analog...   Link to Microphone explanation video    • Wonderful facts about Electret microphones   also in this video you will get answers for these questions below. What is easiest method to build a megaphone circuit? How to connect a microphone to a speaker? How to playback microphone sound through speaker? How audio amplifiers work? How a diaphragm works in microphone or speaker? How much voltage can I apply to a speaker? What does power and resistance mean in a speaker? What is most simple audio amplifiers works? How to shift voltage signal range using resistors? How to bias a transistor using resistors? Here in this video you will find answers of these questions