Question $1(25$ marks$)$

Use constant$-$voltage$-$drop model to analyse the circuit in Figure $1.$

$($a$)$ Re$-$draw the circuit by replacing each diode with its equivalent circuit.

$(5$ marks $)$

$($b$)$ Calculate the values of $I_1,I_2,I_3$ and $I_5.$

$(15$ marks $)$

$($c$)$ Determine the voltage across $R_1,V_{RI}.$

$(5$ marks $)$

Figure $1$

Can u redraw a$)$