单词	photoelectric cell
释义	photoelectric cell(photocell) Any of several devices that produce an electric signal in response to exposure to electromagnetic radiation. The original photocells utilized photoemission from a photosensitive cathode (photocathode ). The electrons emitted are attracted to an anode. A positive potential on the anode enables a current to flow through an external circuit, the current being proportional to the intensity of the illumination on the cathode. The electrodes are enclosed in an evacuated glass tube (see also photomultiplier). More modern light-sensitive devices utilize the photoconductive effect and the photovoltaic effect (see photoelectric effect; photodiode; phototransistor; solar cell). See illustration. Photoelectric cells
随便看	diffusion pump digit digital audio tape digital computer digital display digital recording digitron dihedral dilatancy dilation dilatometer dimensional analysis dimensions diode dioptre dip dipole dipole radiation dipole-dipole interaction Dirac constant Dirac equation Dirac, Paul Adrien Maurice direct current direct motion direct-current motor

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