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Electronic Devices and Circuits - Engineering

Q1:

In the circuit of figure the function of resistor R and diode D are

A to limit the current and to protect LED against over voltage

B to limit the voltage and to protect LED against over current

C to limit the current and protect LED against reverse breakdown voltage.

D none of the above.

ANS:C - to limit the current and protect LED against reverse breakdown voltage.

Resistance limits current and diode is reverse connected and therefore protects LED against reverse breakdown.