Overview - RI
... Define electric current as the number of electrons flowing through a wire over a given period of time. Explain how conductivity and resistivity relate to electric current. Infer the relationships between current, voltage, and resistance as described in Ohm’s Law (I = V / R). Explain how elec ...
... Define electric current as the number of electrons flowing through a wire over a given period of time. Explain how conductivity and resistivity relate to electric current. Infer the relationships between current, voltage, and resistance as described in Ohm’s Law (I = V / R). Explain how elec ...
OLED Display.pdf - 123SeminarsOnly.com
... expectations of organic light-emitting diodes (OLEDs) are realized. This emerging lighting technology using organic light-emitting materials, a counterpart to conventional semiconductor-based LEDs, could open up new application areas for lighting if it moves from its current R&D status to commercial ...
... expectations of organic light-emitting diodes (OLEDs) are realized. This emerging lighting technology using organic light-emitting materials, a counterpart to conventional semiconductor-based LEDs, could open up new application areas for lighting if it moves from its current R&D status to commercial ...
Thermions - Assam Valley School
... not get heated upon the passage of electric current, but when heated by some other source emits thermions is called indirectly heated thermion emitter. (b) The indirectly heated thermion emitter is better because: (i) It emits thermions at a far lower temperature on account of its lesser work functi ...
... not get heated upon the passage of electric current, but when heated by some other source emits thermions is called indirectly heated thermion emitter. (b) The indirectly heated thermion emitter is better because: (i) It emits thermions at a far lower temperature on account of its lesser work functi ...
Rad Tech 110
... The autotransformer works on the principle of self-induction. It has a single core and is responsible for varying the voltage. Because of its ability to adjust voltage, the autotransformer can be either a stepup or step-down transformer. ...
... The autotransformer works on the principle of self-induction. It has a single core and is responsible for varying the voltage. Because of its ability to adjust voltage, the autotransformer can be either a stepup or step-down transformer. ...
Photomultiplier
Photomultiplier tubes (photomultipliers or PMTs for short), members of the class of vacuum tubes, and more specifically vacuum phototubes, are extremely sensitive detectors of light in the ultraviolet, visible, and near-infrared ranges of the electromagnetic spectrum. These detectors multiply the current produced by incident light by as much as 100 million times (i.e., 160 dB), in multiple dynode stages, enabling (for example) individual photons to be detected when the incident flux of light is very low. Unlike most vacuum tubes, they are not obsolete.The combination of high gain, low noise, high frequency response or, equivalently, ultra-fast response, and large area of collection has maintained photomultipliers an essential place in nuclear and particle physics, astronomy, medical diagnostics including blood tests, medical imaging, motion picture film scanning (telecine), radar jamming, and high-end image scanners known as drum scanners. Elements of photomultiplier technology, when integrated differently, are the basis of night vision devices.Semiconductor devices, particularly avalanche photodiodes, are alternatives to photomultipliers; however, photomultipliers are uniquely well-suited for applications requiring low-noise, high-sensitivity detection of light that is imperfectly collimated.