The reverse saturation current \(I_{o}\) of a silicon cell at \(40^{\circ} \mathrm{C}\) is \(1.8 \times 10^{-7} \mathrm{~A}\). The short circuit current when exposed to sunlight is \(5 \mathrm{~A}\). From this information, compute

a. Open circuit voltage.

b. Maximum power output of the cell.

c. The number of \(4 \times 4 \mathrm{~cm}\) cells needed to supply \(100 \mathrm{~W}\) at \(12 \mathrm{~V}\). How must the cells be arranged?