QUESTION $1$

a$)$ Figure $1$ depicts a DC circuit with three resistors connected in series. Calculate the voltage drop across each resistor and demonstrate that the total voltage drop in series circuit is equal to the supply voltage.

$(13$ marks$)$

b$)$ Figure $2$ shows a series$/$parallel circuit. Determine the current, $I_s$ and current in each element. Then find voltage drop at $5.$

$($I$2$ marks$)$