Question $4$

$4.($a$)$ A d$.$c$.$ voltage source of $600$ V has an output resistance of $25.$ Sketch the Norton equivalent circuit for this arrangement, showing the appropriate numerical values calculated.

$[5$ marks$]$

$($b$)$ For the circuit shown in Figure $4\mathrm{.}1,$ reduce the circuit to a Norton equivalent circuit for terminals $a,b.$

$($Hint: you may find repeated use of Th$$venin $-$ Norton transformations for circuit parts useful in simplifying the circuit.$)$

Figure $4\mathrm{.}1$

$($c$)$ For a Norton Equivalent circuit with $I_{SC}=200mA$ and $R_N=50,$ what is the maximum power that can be transferred to a load resistor, $R_L?$ State clearly the value of $R_L$ you would select to achieve this condition.

$[5$ marks$]$