powering an electrect microphone

[tune]

does an electrect mike have polarity as in positive and -ve terminals if so wats, the minimum voltage to power it?

 

[cj_elec_tech]

Hi tune.
The info at
http://en.wikipedia.org/wiki/Electret_microphone
answer your questions. Additionally, follow the links at the bottom of the page to further information - the link
http://www.hosiden.co.jp/web/english/web/products/pdf/e_on06_mic.pdf
may be of interest too.
Also, you could Google it and I'm sure you'd find lots of info.

CJ