phototube

[foh-tuh-toob, -tyoob]

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noun Electronics.

an electron tube with a photosensitive cathode, used like a photocell.

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Also called photoelectric tube.

Origin:
1925–30; photo- + tube

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Phototube is always a great word to know.

So is alternating current. Does it mean:

electric current that reverses direction at regular intervals

unit of electrical resistance

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Collins

World English Dictionary

phototube (ˈfəʊtəʊˌtjuːb)

—n
	a type of photocell in which radiation falling on a photocathode causes electrons to flow to an anode and thus produce an electric current

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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phototube

pho·to·tube