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191005 - Motors and Generators
191005 - Motors and Generators

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... To request other materials, documentation, and information, contact your local Lattice Semiconductor sales office or visit the Lattice Semiconductor web site at www.latticesemi.com. Disclaimers These materials are provided on an “AS IS” basis. Lattice Semiconductor Corporation and its affiliates dis ...
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... 12. In the circuit shown above, the value of r for which the current I is 0.5 ampere is (A) 0  (B) 1  (C) 5  (D) 10  (E) 20  13. Which of the following will cause the electrical resistance of certain materials known as superconductors to suddenly decrease to essentially zero? (A) Increasing the ...
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Opto-isolator



In electronics, an opto-isolator, also called an optocoupler, photocoupler, or optical isolator, is a component that transfers electrical signals between two isolated circuits by using light. Opto-isolators prevent high voltages from affecting the system receiving the signal. Commercially available opto-isolators withstand input-to-output voltages up to 10 kV and voltage transients with speeds up to 10 kV/μs.A common type of opto-isolator consists of an LED and a phototransistor in the same opaque package. Other types of source-sensor combinations include LED-photodiode, LED-LASCR, and lamp-photoresistor pairs. Usually opto-isolators transfer digital (on-off) signals, but some techniques allow them to be used with analog signals.
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