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Formulas - Brown Book Shop
Formulas - Brown Book Shop

... Parallel Circuits Note 1: Total resistance is always less than the smallest resistor RT = 1/(1/R1 + 1/R2 + 1/R3 +...) Note 2: Total current is equal to the sum of the currents of all parallel resistors Note 3: Total power is equal to the sum of power of all parallel resistors Note 4: Voltage is 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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