QUESTION $2[25$ MARKS$]$

$($a$)$ Table $1$ below lists all the equipment and components available to be used in a high voltage lab.

Table $1$: List of Equipment$/$Component in the Lab

$\backslash$table$[[$No$,$Equipment$/$Component$,$No of units$],[1,\backslash$table$[[\frac{1}{25}kV$ transformer$],[($Adjustable output from $1-25kV)]],3],[2,$Various sizes of spark gaps,unlimited$],[3,$Various sizes of inductors,unlimited$],[4,$Various sizes of diodes,unlimited$],[5,$Various sizes of capacitors,unlimited$],[6,$Various sizes of resistors,unlimited$]]$

Design the following output voltage to be used in an equipment testing:

$($i$)150$ kV DC voltage waveform

$[10$ Marks$]$

$($ii$)48$ kV AC voltage waveform

$[10$ Marks$]$

In designing the system, a detailed explanation on the proposed system together with its schematic diagram, relevant calculations and a sketch of its corresponding output voltage must also be provided.

$($b$)$ With the aid of relevant figures and$/$or equations, explain carefully how a high ohmic resistor in series with a microammeter works AND highlight one main disadvantage of this measurement method.

$[5$ Marks$]$