What is the current flowing through the Zener diode in the given circuit in $mA$?

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

$A$ Zener diode voltage regulator operated in the range $120 \, V - 180 \, V$ produces a constant supply of $110 \, V$ and $250 \, mA$ to the load. If the maximum current is equally shared between the load and the Zener diode, then the values of load resistance $(R_L)$ and series resistance $(R_S)$ are respectively

The following diagram shows a Zener diode as a voltage regulator. The Zener diode is rated at $V_Z = 5 \text{ V}$ and the desired current in the load is $5 \text{ mA}$. The unregulated voltage source can supply up to $25 \text{ V}$. Considering the Zener diode can withstand four times the load current, the value of resistor $R_S$ (shown in the circuit) should be . . . . . . $\Omega$. (in $\text{ } \Omega$)

$A$ 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 $.... \Omega$.

The figure shows a $DC$ voltage regulator circuit with a Zener diode of breakdown voltage $= 6\,V$. If the unregulated input voltage varies between $10\,V$ to $16\,V$, then what is the maximum Zener current in $mA$ (in $.5$)?