A transistor has ______ PN junctions. (a) 1 (b) 2 (c) 3 (d) 4

NPN and PNP Transistor

NPN transistor: It is created by sandwiching two N-type semiconductors with a thin layer of P-type semiconductors.

PNP transistor: It is created by sandwiching two P Type semiconductors with a thin layer of N-type semiconductor.

PN Junction diode applications:

• When reverse-biased, a P-N junction diode can be utilised as a photodiode because it is light-sensitive in this arrangement.
• It has a solar cell application.
• The diode can be employed in LED lighting applications when it is forward-biased.
• Therefore a transistor has 2 PN Junctions.

Summary:

A transistor has ___ PN junctions. (a) 1 (b) 2 (c) 3 (d) 4

A transistor has 2 PN junctions. It functions as a voltage-controlled oscillator in varactors and as a rectifier in numerous electric circuits.