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The phone is created to transmit acoustic signals at a distance by means of electrical signals. -
The computer can be used to make calculations, make documents,... What explains the function is that the computer performs the software. -
The telegraph is used to send text messages. -
The radio is used to listen to things from other places. -
The television transforms the electrical signal it receives into the image we see on the screen. -
Tablets work almost the same as a computer, although sometimes they are focused to be used more for reading some content and web browsing than for professional uses. -
it is for talking to people and writing and for carrying it by hand