Harvard Mark I
Yes,Mark-1 used 3300 electromagnetic relays.The first computer that used electromagnetic relays was COMPLEX CALCULATOR.
Depending on the type, a computer can be considered an electromechanical device. This is because some parts feature mechanical operation (e.g. floppy disk drives and optical drives) while others are purely electronic.
vacuum tubes
1) protection of various ac and dc components 2)it can be used for differential protection 3)used as auxiliary relays in contact systems of protective relaying schemes
IrDa
Infrared. :)
1951 was when the first computer was used
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To transfer coded data from the mouse to the computer. It relays information about how the mouse should act onscreen.
The country that was the first to use the computer was Germany. This computer was a binary calculator and was used to complete mathematical computations. The first computer used for breaking codes was used in England.
kinds of electrical relays
It can send out an electromagnetic pulse, causing a global computer meltdown.