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neet test paper 10 - Sigma Physics Centre
neet test paper 10 - Sigma Physics Centre

... One conducting U tube can slide inside another as shown in figure, maintaining electrical contacts between the tubes. The magnetic field B is perpendicular to the plane of the figure. If each tube moves towards the other at a constant speed v, then the emf induced in the circuit in terms of B, I and ...
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... requires the load circuit to be ON for 60 milliseconds and OFF for 60 milliseconds. (Remember - the ON and OFF times will essentially be equal due to the 50% duty cycle specification inherent in the model 423) The voltage across the load circuit would look something this: ON Time = .06 Second (60 mi ...
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Embedded Computer Systems Elec 296
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... • A Universal Asynchronous Receiver/Transmitter, abbreviated UART ( /ˈjuːɑrt/), is a type of "asynchronous receiver/transmitter", a piece of computer hardware that translates data between parallel and serial forms. The universal designation indicates that the data format and transmission speeds are ...
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... Characteristics of the CP-E range - Output voltage 5 V, 12 V, 24 V, 48 V DC - Adjustable output voltages - Output current 0.625 A / 0.75 A / 1.25 A / 2.5 A / 3 A / 5 A / 10 A / 20 A - Power range 15 W, 18 W, 30 W, 60 W,120 W, 240 W, 480 W - High efficiency of up to 90 % - Low power dissipati ...
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... The resistance of copper wires in the walls of your home is less than 0.1 . So Rwire << Rbulb  100 . Rwire is small, but not zero  wires get hot if too much current  fire hazard. So all circuits in your house have fuses or circuit breakers which automatically break the circuit if the current ex ...
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... same voltage V, the electric current i, in the semiconductor will increase. In this case, according to eq. [1], the resistance decreases. In this lab, you will observe the difference in the temperature dependence of a conductor (the tungsten filament of a light bulb) and a semiconductor (the carbon ...
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Resistive opto-isolator



Resistive opto-isolator (RO), also called photoresistive opto-isolator, vactrol (after a genericized trademark introduced by Vactec, Inc. in the 1960s), analog opto-isolator or lamp-coupled photocell, is an optoelectronic device consisting of a source and detector of light, which are optically coupled and electrically isolated from each other. The light source is usually a light-emitting diode (LED), a miniature incandescent lamp, or sometimes a neon lamp, whereas the detector is a semiconductor-based photoresistor made of cadmium selenide (CdSe) or cadmium sulfide (CdS). The source and detector are coupled through a transparent glue or through the air.Electrically, RO is a resistance controlled by the current flowing through the light source. In the dark state, the resistance typically exceeds a few MOhm; when illuminated, it decreases as the inverse of the light intensity. In contrast to the photodiode and phototransistor, the photoresistor can operate in both the AC and DC circuits and have a voltage of several hundred volts across it. The harmonic distortions of the output current by the RO are typically within 0.1% at voltages below 0.5 V.RO is the first and the slowest opto-isolator: its switching time exceeds 1 ms, and for the lamp-based models can reach hundreds of milliseconds. Parasitic capacitance limits the frequency range of the photoresistor by ultrasonic frequencies. Cadmium-based photoresistors exhibit a ""memory effect"": their resistance depends on the illumination history; it also drifts during the illumination and stabilizes within hours, or even weeks for high-sensitivity models. Heating induces irreversible degradation of ROs, whereas cooling to below −25 °C dramatically increases the response time. Therefore, ROs were mostly replaced in the 1970s by the faster and more stable photodiodes and photoresistors. ROs are still used in some sound equipment, guitar amplifiers and analog synthesizers owing to their good electrical isolation, low signal distortion and ease of circuit design.
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