Dark current is the constant response exhibited by a receptor of radiation during periods when it is not actively being exposed to light. It may refer to:
- Dark current (biochemistry) : The depolarizing current, carried by Na+ ions, that flows into a photoreceptor cell when unstimulated.
- Dark current (physics): The relatively small electric current that flows through a photosensitive device when no photons are entering the device.
- Dark current (chemistry) : The constant response produced by a spectrochemical receptor, in the absence of radiation.
Famous quotes containing the words dark and/or current:
“The Past—the dark unfathom’d retrospect!
The teeming gulf—the sleepers and the shadows!
The past! the infinite greatness of the past!
For what is the present after all but a growth out of the past?”
—Walt Whitman (1819–1892)
“Without the Empire we should be tossed like a cork in the cross current of world politics. It is at once our sword and our shield.”
—William Morris Hughes (1864–1952)