$A$ $5.0 \, V$ stabilized power supply is required to be designed using a $12 \, V$ $DC$ power supply as an input source. The maximum power rating of the zener diode is $2.0 \, W$. The minimum value of resistance $R_{s}$ in $\Omega$ connected in series with the zener diode will be (in $.5$)

$A$ diode has Zener voltage of $10 \text{ V}$ and maximum power dissipation of $0.5 \text{ W}$. The minimum resistance to be used in series with this diode for safety when it is connected to a $25 \text{ V}$ power supply is . . . . . . $\Omega$.

The value of the resistor,$R_S$,needed in the $dc$ voltage regulator circuit shown here,equals

In the given circuit,the current through the zener diode is ...... $mA$.

$A$ 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 connection with the circuit drawn below,the value of current flowing through $2\, k\Omega$ resistor is ............. $\times 10^{-4} A$.