photodetector

[foh-toh-di-tek-ter]

pho·to·de·tec·tor

[foh-toh-di-tek-ter]
noun
2.
Electronics. any device, as a photodiode, phototube, or photovoltaic cell, that uses the photoelectric effect to convert radiant energy into an electrical signal.

Origin:
1945–50; photo- + detector
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Photodetector is always a great word to know.
So is capacitive reactance. Does it mean:
opposition of inductance to alternating current
opposition of capacitance to alternating current
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