A zener diode of power rating $2\, {W}$ is to be used as a voltage regulator. If the zener diode has a breakdown of $10 \,{V}$ and it has to regulate voltage fluctuated between $6\, {V}$ and $14\, {V}$, the value of ${R}_{{s}}$ for safe operation should be $….\Omega$

Zener breakdown takes place if

The value of power dissipated across the zener diode $\left( V _{ z }=15 V \right)$ connected in the circuit as shown in the figure is $x \times 10^{-1}$ watt. 

The value of $x ,$ to the nearest integer, is …………..

For the circuit shown below, calculate the value of ${I}_{{z}}$ : (In ${mA}$)

Zener diode is used as