Which of the following semi-conducting devices is used as a voltage regulator?

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

An experiment is performed to determine the $I-V$ characteristics of a Zener diode,which has a protective resistance of $R = 100 \,\Omega$ and a maximum power dissipation rating of $P = 1 \,W$. The minimum voltage range of the $DC$ source in the circuit is

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

In the following circuit,the current flowing through the Zener diode is (in $\text{ mA}$)

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