$2B$

Figure Q$1($c$)$

A$.$ Shown in Figures Q$2($a$-$i$)$ and $Q2(a-ii)$ is a dc source connected to a motor through a diode.

i$.$ State the purpose of the diodes in both circuits

ii$.$ Which of the configurations would you prefer and why?

iii. Assume that the motor draws a stall current of $500$ mA $,$ estimate the minimum ratings of the diode required in terms of peak inverse voltage $($PIV$)$ and forward diode current for both circuits $($Figures Q$2($a$)$ and $2($b$)).$ Explain all assumptions.

B$.$

Circuit A $($Figure Q$2($b$))$

Assume that the red LED turns on with a forward voltage of $2\mathrm{.}0$ V $,$ and that the blue LED turns on with a forward voltage of $4\mathrm{.}0$ V $.$

i$.$ Select resistance values for R$1$ and R$2$ such that $30$ mA flows through each LED.

Circuit B $($Figure Q$2($b$))$

Assume that the red LED turns on with a forward voltage of $2\mathrm{.}0$ V $.$