Describe the action of a transistor as a switch with the help of a diagram

In the above circuit diagram ${\mathrm{V}}_{\mathrm{CC}}=6 \mathrm{V}, {\mathrm{V}}_{\mathrm{O}}=0.5 \mathrm{V}, {\mathrm{R}}_{\mathrm{C}}=800\mathrm{\Omega } \mathrm{and} \mathrm{\alpha }=0.96$.

Determine the collector emitter voltage and the base current.

When $Si$ is doped with $B$, what will be the type of resulting semiconductor? Will it possess overall charge neutrality? Under what condition $n_e{n}_h=n_i^2$?

You want to run an electric motor using a self-made full wave rectifier. Draw a neatly labelled diagram to serve your purpose.

In which of the following case(s), the bulb will not glow? Explain in very brief. Calculate the forward and reverse resistance of a $\mathrm{Si}$ diode from the following $\mathrm{V}-\mathrm{I}$  characteristic curve shown in the figure  $4$.

You know that to get a regulated d.c voltage, we connect a Zener diode across the output terminals of a rectifier Draw a circuit diagram comprising a Zener diode, series resistor $\left({\mathrm{R}}_{\mathrm{S}}\right)$and a load resistor $\left({\mathrm{R}}_{\mathrm{L}}\right)$ indicate the direction of current ${\mathrm{I}}_{\mathrm{Z} ,}{\mathrm{I}}_{\mathrm{S}}(=\mathrm{I}, \mathrm{total} \mathrm{current}) \mathrm{and} {\mathrm{I}}_{\mathrm{L}}$ passing through the Zener diode,${\mathrm{R}}_{\mathrm{S},}{\mathrm{R}}_{\mathrm{L}}$ respectively. Choose the correct option from the following,

(1) ${\mathrm{I}}_{\mathrm{L}}={\mathrm{I}}_{\mathrm{Z}}$ (2) $I_L> I_Z$ (3) $I_L< I_Z$

 How can we achieve the right option?

In such a circuit if ${\mathrm{V}}_{\mathrm{Z}}=6 \mathrm{V}, {\mathrm{I}}_{\mathrm{L}}=4.0 \mathrm{A}, \mathrm{and} {\mathrm{I}}_{\mathrm{Z}}=20 \mathrm{mA}$ and the unregulated input is $10 \mathrm{V}$, calculate the value of series to work satisfactorily.