Wonderful facts about Electret microphones

Maybe you have worked with capacitive microphones already, but most of you don’t know what is going on inside them. This causes many ambiguities. In this video you will see a full explanation about electret microphones. Also you will get answers for these questions below.
How a capacitive microphone works?
What is inside a microphone?
Why there is a MOSFET inside a microphone?
What is a voice signal?
How to interface a microphone?
Are microphones polarized components?
Do microphone have polarity?
How to know which terminal of microphone is negative or positive?
How much current can pass through a microphone?
What is difference among capacitive, condenser and electret microphones?
How to see microphone signal on oscilloscope?
Here in this video you will get answer of these questions