Why NPN transistors are mostly used than PNP transistors?

Question Consider the circuit shown in Figure I Figure 1 Calculate the values of the following variables. The subscripts and denote Base, Emitter and Collector of the transistor, respectively. (NOTE Show your cakaltions、lou cumwse 5-150 for the transistor). a(cale.)- (cale.)- e (cale.) - 4 (calc) e (cale.)- t(calc.) 2 Consider the circuit shown in Figure 2 Figure 2 Calculate the values of the following variables (NOTE Show your calculations. You can use β-150for the ransistor) a (cale.) (cale) (cale. ) . 4 (cale. ) e (calc.) t (cale) (cale.) =

Resistors in parallel Two resistors wired in parallel in an electrical circuit give an effective resistance of R(x, y) = xy/x + y, where x and yare the positive resistances of the individual resistors (typically measured in Ohm s). Graph the resistance function using the window [0, 10] times [0, 10] times [0, 5]. Estimate the maximum value of R for 0