A zener diode of power rating 1.6 W is to be used as voltage regulator. If the zener diode has a breakdown of 8V and it has to regulate voltage fluctuating between 3V and 10 V. The value of resistance Rs for safe operation of diode will be:
Select the correct option:
A
13.3
B
12
C
10
D
13
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
Ans. (3)
Sol.
$$
\begin{aligned}
& V_2=8 \text { volt } \\
& V_A-V_B=8 \text { volt }
\end{aligned}
$$
Current through zener diode, $\mathrm{i}=\frac{\mathrm{P}}{\mathrm{V}}=\frac{1.6 \mathrm{~W}}{8 \mathrm{~V}}=0.2 \mathrm{~A}$
$$
\begin{aligned}
& V_C-V_A=10-8 \text { volt } \\
& \therefore R=\frac{V_C-V_A}{i}=\frac{2 V}{0.2 A}=10 \Omega
\end{aligned}
$$
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