Answer / nirmalyabasu

If the power is comming through the i/p or o/p device to
the io card then that i/o card is called sinking i/o card.
And if the power is transfered from io card to the i/p and
o/p devices then the i/o card is called sourceing io card

Answer / mun

sinking and sourcing is regards the current flow
so if the power from the card is called sourcing
if the power from out side the card coming to it called
sinking

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