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Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsSemiconductor Electronic: Material, Devices And Simple Circuits3 Marks
Question
  1. A student wants to use two p-n junction diodes to convert alternating current into direct current. Draw the labelled circuit diagram she would use and explain how it works.
  2. Give the truth table and circuit symbol for NAND gate.
✓

Answer

  1.  

Working:

  • For +ve half cycle of AC source, let A be at +ve potential and B and –ve potential, So, D1 will be forward biased and D2 will be reversed biased. Itmeans currentwill only flow through D1 and current will not flow through D2. Output is obtained across RL.
  • For -ve half cylce, B will be at +ve potential and point A at –ve potential, So, D1 will be reversed biased and D2 will be forward biased Itmeans that current will only flow through D2 and not through D1, output is obtained across RL.

This process is called full wave rectification and the device is called full wave rectifier.

  1. Truth Table:

Logic Symbol:

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