You really think or say that a device burning a dvd disc or playing
music is using the energy for only to generate heat ? There occures
some heat but it is obvious that the amount of energy used by the
device is not equal to the heat it generated.I do not even mention
about piezo materials.

Yigit
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist