The $I-V$ characteristics of an electronic device are shown in the figure. The device is:

Manufacturers supply a zener diode with zener voltage $V_{z}=5.6 \, V$ and maximum power dissipation $P_{z \max }=\frac{1}{4} \, W$. This zener diode is used in the following circuit. Calculate the minimum value of the resistance $R_s$ in the circuit so that the zener diode will not burn when the input voltage is $V_{in}=10 \, V$. (in $\Omega$)

$A$ Zener diode acts as a/an

The reading of the ammeter in the following circuit will be in $mA$.

If the current in the Zener diode is five times the current in $R_1$ and the breakdown voltage of the diode is $6 \text{ V}$,find the value of $R$.

In the following circuit,the current flowing through the $1\,k\Omega$ resistor is......$mA$.