For a $0\mathrm{.}017$ m$2$ PV cell, the reverse saturation current is I$0=41011$ A and at an insolation of $1-$sun $(1$ sun $=1000$ W$/$m$2)$ the short$-$circuit current is ISC $=6\mathrm{.}4$ A$.$ Assume the cell temperature is $25$C$,$ parallel resistance Rp$=5$ and series resistance Rs$=0\mathrm{.}05,$ draw the I$-$V plots based on the four equivalent electrical circuits we discussed:

$1)$ the simplest circuit without Rp and Rs

$2)$ the circuit with Rp only

$3)$ the circuit with Rs only

$4)$ the circuit with both Rp and Rs