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In a semiconductor diode, what is meant by potential barrier? Draw a labelled circuit diagram of a…
(i)[1.5]
In a semiconductor diode, what is meant by potential barrier?
(ii)[2.0]
Draw a labelled circuit diagram of a Zener diode as a voltage regulator.
Draw: Circuit diagram of a Zener diode as a voltage regulator
Must show: Unregulated DC input voltage, Series resistor R_s, Zener diode connected in reverse bias across load, Load resistor R_L, Regulated DC output voltage across R_L
(iii)[1.5]
Show with the help of a diagram, how you will obtain an AND gate using only NAND gates. (Truth table is not required.)
Draw: Logic circuit showing how an AND gate is obtained using only NAND gates
Must show: First NAND gate with inputs A and B, Second NAND gate acting as inverter connected to output of first NAND gate, Final output Y = A \cdot B
Answer
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From ISC 2020 Physics Paper 1, question 22(a).