The correct symbol for a Zener diode is:

$A$ Zener diode with $5\ V$ Zener voltage is used to regulate an unregulated $DC$ voltage input of $25\ V$. For a $400\ \Omega$ resistor connected in series, the Zener current is found to be $4$ times the load current. The load current $(I_L)$ and load resistance $(R_L)$ are:

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

$A$ potential divider circuit is connected to a $DC$ source of $20 \,V$, a light emitting diode $(LED)$ with a glow-in voltage of $1.8 \,V$, and a Zener diode with a breakdown voltage of $3.2 \,V$. The total length $(PR)$ of the resistive wire is $20 \,cm$. The minimum length of $PQ$ required for the $LED$ to just glow is ............. $cm$.

$A$ $5.0 \, V$ 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 $.5$)

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