What is the working principle of cellular phone?
You can't, but if you think that you should be able to maybe send an e-mail to Apple or like iTunes ! Also if you really want to write something and lock it go buy the diary app :)
What is the working principle of electric iron?
Heat generated by electrical resistance. Thermal mass of a metal plate.
What is working principle of washing machine?
Smelly clothes in, magic happens, cleaner clothes out.
Working principle of camera?
What is the working principle of ip camera?
Working principle of relay?
go to this website.http://220.127.116.11/rcaaccessories/RcaaccessoriesProductDetail.do?ACTION_TYPE_ID=ACTION_TYPE_PRODUCT_DETAIL&ACTION_CATEGORY_IDSTR_CATEGORY_4_DEVICE_REMOTES&ACTION_PRODUCT_ID=RCR...
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