$5\mathrm{.}91$ Use source exchange to find $I_o$ in the network in Fig. P$5\mathrm{.}91.$

Figure P$5\mathrm{.}91$

$5\mathrm{.}100$ Find $I_o$ in the network in Fig. P$5.100$ using source transformation.

Figure P$5.100$

$5\mathrm{.}106$ For what value of $R_L,$ the power deliverd to $R_L$ will be maximum in Fig. P$5\mathrm{.}106.$