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LECTURER-21 SOLID DIELECTRICS USED IN PRACTICE Solid
LECTURER-21 SOLID DIELECTRICS USED IN PRACTICE Solid

... Glass is a thermoplastic inorganic material comprising complex systems of oxides SiO2 . The dielectric constant of glass varies from 3.7 to 10 and the density varies from 2.2 to 6 g/cm3. At room temperature, the volume resistivity of glass varies from 1012 to 1020 ohm cm. The dielectric loss of glas ...
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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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