With neat circuit diagram describe the working of `P—N` junction diode and discuss about its forward characteristics.

With neat circüit diagram describe N-P-N transistor.

With neat circuit diagram describe the principal,construction and working of a potentiometer.

With neat circuit diagram describe the PNP transistor and what are their application.

With neat ray diagram describe the working and magnifying power of a compound microscope.

with neat circuit diagram describe the construction and working of centretap full wave rectifier.

With a neat circuit diagram, explain the working of a full-wave rectifier made of junction diodes. Discuss the nature of the output current and voltage.