When the $Zener$ diode is used as a voltage regulator, it is connected in

In a Zener diode,

$A$ Zener diode with a power rating of $1 \, W$ is to be used as a voltage regulator. If the Zener diode has a breakdown voltage of $5 \, V$ and it has to regulate an input voltage that fluctuates between $3 \, V$ and $7 \, V$,what should be the value of the series resistance $R_s$ for safe operation? (See figure)

In the given circuit,what is the maximum value of $R_S$ (in $k\Omega$) for the Zener diode to regulate the voltage across the load resistance $R_L$?

$A$ Zener diode of power rating $2 \, W$ is to be used as a voltage regulator. If the Zener diode has a breakdown voltage of $10 \, V$ and it has to regulate an unregulated input voltage that fluctuates between $6 \, V$ and $14 \, V$, the value of $R_s$ for safe operation should be $.... \Omega$.

$A$ Zener diode having a Zener voltage of $8\, V$ and a power dissipation rating of $0.5\, W$ is connected across a potential divider circuit as shown in the diagram. The value of the protective resistance $R_p$ is $....\, \Omega$.