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An operational amplifier with an LDR is used as a:

Correct answer: C. Night switch

  • A. Half wave rectifier
  • B. Gate
  • C. Night switch
  • D. Full wave rectifier

Explanation

C is the answer as the polarity of the output of the OP-AMP would change based on the input and since the LDR is placed on one of the inputs, we can say that the output polarity is dependent on the light intensity which is perfect for a night switch.

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About Electronics

A p-n junction forms when p-type and n-type semiconductor regions meet, creating a depletion layer, barrier potential and rectifying action. The work covers forward and reverse bias, junction current, diode characteristics, and how a diode converts alternating current into pulsating direct current through half-wave and full-wave rectification.

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