Question $3$

$[10$ Marks$]$

a$.$ A module with $40$ cells has an idealized, rectangular I$-$V curve with $I_{SC}=4$A and $V_{OC}=20$ V $.$ If a single cell has a parallel resistance of $5$ and negligible series resistance, draw the I$-$V curve if one cell is completely shaded. What current would it deliver to a $12-V$ battery?

rigure $\frac{?}{{?}_{?}}$ : Daggrain tor question $s($a$)$

b$.$ The following figure shows two I$-$V curves. One is for a PV cell with an equivalent circuit having an infinite parallel resistance $($and no series resistance$).$

What is the parallel resistance in the equivalent circuit of the other cell?

Figure $3$: Diagram for question $3($b$)$