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computer-Charles Babbage
The computer does its primary work in a part of the machine we can't see, a control center that converts data input to information output. it has a keybord to write and a mouse. -
Telegraph-Samuel F.B Morse
it worked with a part called the transmitter that sent electric currents through the wires. At the other end, the currents moved needles on a part called the receiver. it has a special plate with letters and numbers on it to send messages. -
Telephone- Antonio meucci
the phone works in such a way that the sound is transformed into electrical energy, is transported through the cables and is transformed back into sound in another phone located on the other side in the distance. -
Television- John Logie Baird
It consists of three parts: the television camera that converts an image and sound into a signal; the TV transmitter that sends the signal over the air; and the TV receiver that captures the signal and converts it back into image and sound. -
tablet-Alan kay
A tablet is a portable, wireless personal computer with a touch screen. The tablet form factor is typically smaller than a laptop, but larger than a smartphone. -
Mobile phone-Martin Cooper
They come in use for communicating through voice, messages, and mails. We can also surf the internet using a phone. Most importantly, we also click photos and record videos through our mobile's camera. The phones of this age are known as smartphones. -
Radio- Guigliemo Marconi
radio works by transmitting and receiving electromagnetic waves. The radio signal is an electronic current moving back and forth very quickly. A transmitter radiates this field outward via an antenna; a receiver then picks up the field and translates it to the sounds heard through the radio.