Electronics can seem to be really wierd at times. I have pointed out certain questions below; try to find answers to them. They quiz your fundamental understanding of the subject. If you donot egt the answers feel free to get in touch.

1. A PN junction diode when forward biased the bias voltage causes holes from P region to go into the N region where there is an abundance of holes. Obviously recombination should take place. Similarly the electron from the N region to go into the P region and recombine with holes there. Wouldn't this lead to the formation of a depletion region? And if so wouldn't the depletion region width increase when we forward bias the diode? But we know in forward bias depletion region width decreases and current flows. Explain how.
   
   
   
2. In a MOSFET the current through the channel is controlled by the gate voltage. But we know the gate terminal ends in an SiO2 insulator and hence no current flows into the device. Then how is control of channel achieved?
   
   
   
3. Why is power transmitted in AC rather than DC inspite of the fact that DC is preferred in most of the household equipments?
   
   
   
4. If you have a low-voltage problem in your house you might have observed that when the number of customers being delivered power from the transformer increase the voltage comes down. But again we know output voltage of the transformer is constant. Then where is this voltage going?
   
   
   
5. Also you might have observed that the houses nearer to the transformer have a higher voltage than the houses farther to it. Explain why
   
   
   
6. Zener diodes have a lower breakdown voltage. Why?
   
   
   
7. In a halfwave rectifier circuit if you replaced the diode with a Zener diode what happens to output?
   
   
   

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