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
1951 was when the first computer was used
To transfer coded data from the mouse to the computer. It relays information about how the mouse should act onscreen.
IrDa
Infrared. :)
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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
The first computer used for calculation is highly dependent on what you consider a computer to be. In many views, the first computer used for calculations was the abacus which dates back to 2400 BC.