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Diodes and Applications - Technical MCQs

Q1:

Since diodes are destroyed by excessive current, circuits must have:

A higher voltage sources

B current limiting resistors

C more dopants

D higher current sources

ANS:B - current limiting resistors

First you need to know the LED voltage drop. It is safe enough to assume 1.7 volts for non-high-brightness red, 1.9 volts for high-brightness, high-efficiency and low-current red, and 2 volts for orange and yellow, and 2.1 volts for green.